You doubt what? He's 242 lbs right now and intends on putting on as much weight as he can until camp (as he knows he'll drop some weight during the month of August). The goal is to be a lean 235 by the first game.
And yes, KBVol, after getting sick mid-season, he was hovering around 215 which is way too small for his frame. Jalen is a step (if not more) faster than he was last year also.
He has a huge chip on his shoulder and feels that he has a lot to prove. He has worked very hard in the off-season, and the game has slowed down for him tremendously as well.
Expect to see a completely different machine this year.