Quick suggestion for a future game addition:

I noticed that players do not gain weight. So If I recruit a Freshman PF who is 6'7 190 pounds, even as a senior he will be 190 pounds.

College players, develop college bodies over the several seasons. Would be nice to add a weight gain / weight loss function.

Also expanding player attributes, showing things such as speed, agility, stamina, injury, personality.

I like your idea about players gaining weight and a little height maybe.
Speed, agility, and stamina are under the umbrella of athleticism I think, although seeing them as stand alone
attributes would be cool.
Injury risk and personality are on the player profile page.