Look, JO is a decent player. But, under oscar's system, he just isn't doing very well in a lot of games. Maybe oscar should change his system. I think most fans are good with the system, though, and would prefer that JO adapt.
It's really easy to explain away his sub-par performances as "matchup problems," but I'd argue that good players create matchup problems much more often than they do suffer from them.
We're 11 games through Conference play and JO has been entirely ineffective in 5 of these games because of matchup problems. KUx2, ISUx2, and OSUx1. In these 5 games, JO's got 10 pts and 17 boards. This is startling ineffective. It's also startling because these just happen to be the 3 other best teams in the Conference.
So, in other words, JO has performed well against all Conference opponents except the good ones.