Playing quarterback is one of the hardest positions in all of professional sports. It's no wonder that outside of a few reoccurring names, there is simply a lot of job turnover at the position.
Enter how a quarterback's rookie season is pretty significant in terms of predicting future play and that sometimes it's pure bad luck that a quarterback was drafted on a talent-deficient team and subsequently failed to own a solid career.
But just looking at this from a high level historical perspective, rookie quarterbacks typically don't come out of the gate and post massive numbers. Only two quarterbacks (Football Outsiders. Tampa's run game averaged a paltry 3.9 yards per carry headed up by running backs, Rich Hribar of The Fake Football, just two quarterbacks in history have come out of the gate and thrown 25-plus passing touchdowns, and the highest completion percentage for a rookie quarterback who attempted 500 or more passes in their rookie season was Sam Bradford's 60% mark in 2010.
It's quite alright to think Jameis Winston will have a good rookie year and a bright future. In fact, I actually expect him to -- but those notions need historical context.