I don't think we saw enough of Kornet to know whether he's any good or not.
Obviously the fact that he couldn't break into the rotation isn't a good look but Ime was keeping things pretty tight last season.
I wouldn't be surprised if Kornet had more than what we've seen from him thus far.
I mean, he's been in the NBA five seasons. He's played for the Knicks, Bulls, Cavs and Bucks, all of whom moved on from him (in some cases, very quickly). Last year, he spent most of the season in the G-League.
He's, at best, a fringe NBA player. Reportedly he's a very nice guy and is good in the locker room, but it's not like the light bulb is suddenly going to go on age 27. What he brings is poor shooting, poor scoring, poor rebounding and passable pick-and-roll defense for a seven footer.
Starting him and refusing to bring in better players is an absolute insult to the other players on the team, who deserve the best chance to succeed.