I somewhat agree with your post but not the last sentence at all. He was expected to be our top big coming into the season and Barnes surely encouraged him to be aggressive. ON just needs to find smarter ways to be aggressive within the flow of the game.
ON's basketball IQ on offense needs improvement but it's not like his position is one that plays the game with no ball pressure. He faces up to the basket as much or more than he posts up. He gets the ball up top in the screen game a lot and is expected to make a good pass (something Uros is better at) or if he is closer in and has the opportunity then he is expected to drive the ball....a good defense will have guards cutting off his lanes or reaching in to slap at the ball on those drives.
When he does post up and goes to his shoulder facing the paint then he will have guards crashing down from behind or at an angle. He needs to keep the ball up higher and learn when to not dribble into a double team and kick it out instead but it's not completely unexpected for some turnovers to happen with a big who mostly plays going to the basket. I agree that he needs to be better there.
I think this injury will be a good thing for his development and he will get smarter by watching a bit and then playing over the summer, especially if it's for the Finland national team. I expect big things from him next year.....he has an NBA level blend of size, strength and athletic ability to go along with a good 3pt shot and turnaround jumper down low....can also hit midrange jumpers. He is also physical on D, blocks shots and rebounds very well....even over taller guys. If he puts it together he can be all SEC and a 2nd round or late 1st round draft pick.