Fantasy managers who stuck with Davante Adams through the tough start to his professional career were rewarded. After scoring just four times during his first two NFL seasons, Adams broke out in a big way in Year 3, catching 75 passes and 12 touchdowns.

Hindsight's in our favor now, but not bailing on Adams early on was a pretty logical move.

He was tied to Aaron Rodgers, so that was a plus. But Adams was also a beast in college. During his Sophomore year at Fresno State, he caught 131 passes for 1,719 yards and 24 touchdowns. Even as a Freshman, Adams' 100-plus receptions and 1,300-plus receiving yards were nuts.

Sure, he had Derek Carr throwing him the rock. He also had skill. He had talent. Wideouts don't accumulate over 3,000 yards receiving in two college seasons just because they were placed in a good situation.

Davante Adams' college production told us that he had a good chance of being a successful pro.

Because how a wide receiver produces at the college level can really help us figure out whether or not he'll be a winner in the NFL.

Defining Success

We know that Adams is a success story, but where do we draw the line? What is it that decides whether or not a player is successful in the NFL?

There are tons of ways to define success. Is it through longevity? Yards? Receptions? Per-target efficiency?

If you were on numberFire.com last week and who are projected to be higher draft picks. Of course they're going to hurt one another's market share numbers.

Don't mistake that with it meaning they're without concerns, though. Players with Metcalf's production profile rarely pan out. What if Brown and Lodge aren't very good, meaning Metcalf was losing production to bad players? (For the record, I think Brown is very good, especially if you look at the 2017 season.)

Metcalf, like Alabama running back Josh Jacobs, is a high-variance prospect.

Riley Ridley is a wideout I'm far more concerned about. This past season, Ridley hauled in fewer than 18% of Georgia's completed passes, well below the worst mark in our NFL sample. And market share is going to be friendly to Ridley since Georgia was one of the more run-heavy teams in college football last year. Through his three-year college career, Ridley caught just 69 (nice) passes. Almost 70% of the NFL stud sample had 69-plus receptions in their final collegiate season alone.

So, yes, I'd be nervous about taking Riley Ridley in fantasy football rookie drafts unless he falls to a great situation.

Receiving Production Concerns

The average receiving yard share in the successful NFL wide receiver subset was right at 36%. Just 8 of the 26 wideouts failed to reach a 30% share, and half of those 8 didn't play a full final collegiate season, so it made sense that their receiving yard shares were lower than the norm. Only one player -- Michael Crabtree -- wasn't able to maintain a 25% receiving yards share during his final year.

In this year's class, we've got 20 guys who failed to capture 25% of their team's passing yards in 2018.

DraftScout.com has Parris Campbell as a first- or second-round pick, but his final-season numbers don't back that up. He played every single one of Ohio State's games last season, but still accounted for just 21.2% of the team's passing yards, giving him the 11th-worst share in the class. His production profile really doesn't stand out much at all, even if he's going to be used more as a do-it-all player at the NFL level. He had a 22.8% reception share, and he pulled in 24.0% of the Buckeyes' touchdowns last season. The stud wide receiver subset doesn't include a single player with marks that low across the three categories. If there's a positive for Campbell analytically, it's his 60th percentile breakout age.

Deebo Samuel is another prospect a lot of scouts are into, but his final-season numbers are questionable, too. He didn't hit the 1,000 receiving yards mark, and that was in a South Carolina offense that ranked 27th in pass-to-rush attempt ratio among all FBS schools. That resulted in a sub-25% receiving yard share.

Samuel's situation isn't quite like Campbell's, though. As a Sophomore, he actually had better receiving yard and reception share totals than he tallied as a Senior, albeit not by much. Having that type of production early on in his college career is a good thing, but we still should question why his market share numbers weren't higher this past season.

We're dealing with arbitrary cutoffs in the tables above, but one player who barely met the requirements to not show up in said table was Kelvin Harmon. Harmon, a consensus top receiver in this year's class, finished 2018 seeing about 29% of North Carolina State's team passing yards going his way, while his reception share was just 24.3%. He's coming out as a Junior and had a good Sophomore year, but the only player with similar market share averages in the stud wide receiver sample was Doug Baldwin.

Strictly from a production standpoint, Harmon isn't a safe option. You could make the case that his numbers were dinged having played with a draft-hopeful teammate in Jakobi Meyers, but playing with a good teammate shouldn't force us to ignore potential red flags.

Scoring Concerns

Of the three main market share categories we're looking at today -- reception share, receiving yard share, and touchdown share -- touchdown share has the largest difference in percentage between this year's prospect group and our NFL stud sample. The 26 NFL wideouts had an average touchdown share of 43.1% during their final collegiate season, and that was almost 14 percentage points lower than the average for this year's combine invites.

At an individual level, nearly 85% of our stud sample had touchdown shares north of 30% during their final college season. Exactly one half of the 48 wideouts who were invited to this year's combine hit that threshold.

The bottom of the touchdown share list shows Hunter Renfrow, who scored just once for Clemson in 2018. His 2.7% touchdown share is horrific, but it should be noted that he had a 16.1%, 14.3%, and 17.7% share across his first three college seasons, respectively. He's not going to win in that area of the field, but that also means he'll probably have a really low fantasy ceiling at the next level.

One positive with D.K. Metcalf's production profile is in the touchdown column. Despite playing just seven games this past season, he had a higher touchdown share than teammate DeMarkus Lodge, and he scored just one fewer time than A.J. Brown. And as a redshirt Freshman in 2017, Metcalf's touchdown share was 25%. There's nothing wrong with that at all.

Fitting the Mold

If we only look at the average reception, receiving yard, and touchdown shares among our NFL subset and use that as a baseline, two players from this year's class make the cut.

And they're both small-school guys.

Ashton Dulin went to a college no one's ever heard of in Malone University, and against what's more than likely very weak competition, he dominated. He had a near 65% touchdown share, which is one of the highest marks we've seen a player at the combine have during his final collegiate season. He's listed at 6'2'', 210, so he should have the size to compete at the next level, but it's hard to judge a prospect who competed against teams like Alderson Broaddus and Findlay.

The other wideout above is getting more hype, and that's Andy Isabella. During his final season at UMass, Isabella crushed every market share category, and he's expected to get drafted in April. And his draft potential may get even better after the combine's over -- Isabella could put on a show in the 40-yard dash.

After loosening the parameters a bit -- after all, we don't just want to talk about small-school players who dominated lower-tiered competition -- we get the following:

Hakeem Butler and N'Keal Harry are two big production winners in the 2019 class. But Butler's a lot riskier between the two. He's listed at 6'6'', and we don't have a ton of historical success with wide receivers who've been that tall. Only seven wide receivers since 2000 have checked in at that height at the combine, and none of them were NFL successes. We've got plenty at 6'5'', so maybe it's not that big of a deal, but it's still something to watch.

Butler also broke out later than most wide receiving prospects -- his breakout age ranks in just the 30th percentile.

N'Keal Harry is sort of a production dream. He posted numbers immediately as a Freshman at Arizona State, and he had similar market share percentages during both his Sophomore and Junior seasons. Yes, that means his Sophomore season would've also "fit the mold," or at least come close to it. That's bananas.

There are athleticism concerns with Harry, but he -- in my humble, production-loving opinion -- should be the consensus top wide receiver in this class.

We'll see how that changes after the NFL Combine.