It looks like he did very little to develop his game. And if he did put in the time - it's frightening because there are no results to see.
His game is limited to put backs and close range screen and rolls.
He is a horrible passer, has no handle, and an awful looking jumper.
I personally think he is a bigger and stronger from last season... but he has no clue on how to use that strength or bulk.
My guess is... he put time in the weight room and that's about it.