Through his first two NFL seasons, Tampa Bay Buccaneers quarterback Jameis Winston completed 59.6% of his passes and averaged 7.38 yards per attempt. The first number was below league average during that span, but the second one was above league average.
Though the first two preseason games of 2017, Winston has completed 71.9% of his passes and averaged 7.02 yards per attempt. That occurred in roughly three quarters of play, while the numbers above were generated in 32 games, so it would be a stretch to make any concrete claims based on that comparison. Still, those 2017 numbers may represent the beginning of another evolution in Winston's game.