Ladies and Gentlemen, I bring to you
Clinton Creasman, the new gold standard for improvement in a season. I think I've had one player crack the 100 barrier before, and I've seen the 100 mark been a few times on forums when discussing the most growth they have had from a player in a singe season.
Creasman finished the season with 134 points of improvement, and he is going to be a 100 DE (based on blue-to-black at 79), and a mid-80 ATH and SPD. He still has high potential in passing and low post, so I expect the improvement to keep coming.
Anyone ever seen any more growth in a single season?