The main problem with Gobert's offense is his hands. If he could keep the ball in his hands there'd be much more opportunities for the team to use him in O. The problem is, right now you can't really trust him on the low block, simply because in half of the possessions the opponent will poke the ball away. You can't trust him in traffic, because in half of the possessions he either won't be able to catch it or it will get poked away. He needs space in order to be effective in offense, or he needs it up high where nobody can disturb him in catching the ball and finishing it. And it's a shame because whenever he's had some space, he's shown pretty good passing and ability to see the open man.
I have no idea if there are any exercises to strengthen his hands and his ball control... that'd be my first priority with him.
They should make him handle the ball for an hour a day with somebody slapping at it or at his hands... or something like that(I have no idea what appropriate exercise for that particular facet of the game is)