Playing fantasy football is a lot like investing in the stock market. The balancing act between measuring risk and reward can be unnerving.

In bull markets, you can do no wrong. In bear markets, you try and hedge your bets with slow but steady performing stocks. Sometimes markets are wildly unpredictable, with the Dow experiencing gains and losses of multiple percentage points, multiple times within the same week. Investing in high-risk, high-reward stocks, particularly if you haven’t hedged your bets, is not for the faint of heart.

Such is the life of an Football Outsiders' offensive line rankings. But Foster’s rushing success rate also dipped below 40% for the first time in his career, suggesting that his impressive per rush efficiency was attributable to breaking off big runs. And as was the case for Doug Martin, this tendency to break off the home run scamper isn’t always transferable from season to season.

But Foster’s rushing numbers don’t fully reflect his true productivity. Foster’s ability to serve as a three-down back is significantly buttressed by his efficiency in the passing game.

While regressing in efficiency in 2012 and 2013, Foster returned to his near top-of-the-class receiving prowess on a per-target basis in 2014. In fact, Foster’s efforts in the passing game contributed to his finishing fifth in Total NEP among backs with at least 120 carries, besting the likes of Eddie Lacy and DeMarco Murray, both of whom were drafted earlier than Foster in 2014 fantasy leagues. Both of these players also played in 16 games -- compared to Foster’s 13.

So, with Foster’s re-emergence as a top-flight all-purpose back in 2014, do the Texans have some breathing room in seeking out his replacement in this year’s draft? The answer, sadly, is probably not.

The Downturn

With Foster out three games, and largely unused in a fourth game last year, Alfred Blue served as his primary stand-in, amassing 170 carries, providing us with a sample size large enough to render at least some judgment on his abilities. The results? Not pretty.

Blue’s efficiency on a per-rush basis (-0.12) was atrocious in 2014, besting only a handful of numberFire’s Hall of Shame luminaries, including Darren McFadden (-0.15) and Andre Ellington (-0.14). Blue effectively lost 21 expected points for the Texans due to his lack of efficiency. While he did show skills in the passing game, registering a higher per target NEP (0.53 on 18 targets) than Foster (0.46 on 59 targets), it remains to be seen whether this can continue into next season.

The other Texans running back, Jonathan Grimes, has received 60 carries combined over the past two seasons, so it’s tough to judge him with confidence one way or another. In 2013, he was very effective with a mere 21 carries, compiling a 0.06 Rushing NEP per rush. But in 2014, this progress was undone and then some, as Grimes regressed to a near Alf Blue level of inefficiency (-0.08 Rushing NEP per carry) on slightly more carries (39) than the previous season.

Suggesting that Grimes can’t be a legitimate backup based on his performance in 2014 is probably premature, but his performance certainly doesn’t inspire confidence that he’d be able to pick up where Foster left off if an injury sidelined him for a sustained period of time.

Playing the Market

In the upcoming draft, the Texans staff might decide it’s best to address some of their offensive line woes early in the draft as a two-fold strategy. First, Foster would likely be less dependent on big runs to contribute positively toward the team’s expected points. Secondly, Foster’s heir will also benefit from young top-grade talent creating holes for him to run through for years into the future.

With Foster under contract through the 2016 season, the Texans may not have to invest a first round pick in a running back. But it’d be foolish on their part to neglect the position all together in the draft. At the very least, the Texans should consider taking a flier on a back that they’re reasonably certain will outperform Blue or Grimes. That way, if the all-too-familiar injury bug strikes Foster sometime in 2015, they’ll at least have the potential of a back who can put up a positive NEP season. In this instance, they’d be able to capitalize on Blue’s ostensible effectiveness in the passing game while avoiding all of his inefficiencies when accepting handoffs.

Luckily for fantasy owners, the NFL draft is right around the corner, so they can see how the Texans play their hand regarding Foster’s replacement before they draft their fantasy squads. But even if the Texans spend an early round draft pick on a running back, don’t expect Foster to get placed in a 50/50 timeshare.

Foster was too good in 2014 to be ignored, so even if managed to 15 to 20 carries a game, he’ll still put up more than worthy fantasy numbers. Just make sure that you handcuff him on your squad with his heir apparent if the Texans do go that route in case Foster gets sidelined for a few games.

Fantasy owners can be skittish and sensitive, just like the stock market. Thus, with a history of injuries and rumors of his replacement coming to Houston, Foster represents a top-end player that you can probably get in the mid-second round come draft day, who, if healthy, is a near lock to put up first round numbers. Now that’s what I call a market in need of a correction.