I think he's going to be comfortable and confident with that mid-range jumper. Not threes I don't think he'll attempt but if he can make his jumper a threat that opens up the ballfake drive etc. so much he can do
Marek does not have any semblance of a classic J. He has an unorthodox quick release push shot. Josh Pace proved that you do not have to have an orthodox J to score effectively. However, at 6'10" and playing PF, a J would be a weapon he could use at will.