I think the problem with JO is that people want to make his performance this year someone's "fault" and I'm not sure anyone is really at "fault".
He went from a system that played 2 true bigs, to a system that plays 1. JO didn't get worse, but Gip got better and more importantly got into better shape so he can play more effective minutes. Plus, Gip seems to "fit" better into oscar's offense. Regardless, JO is a much different offensive system, and therefore is getting different shots.
Rebounding is better. He turns it over less. Blocking shots at a similar rate. But he fouls more and is shooting more 2PT jumps shots and less at the rim, thus his shooting %-age is down and so is his scoring.
Much of last season he was Franked around, it wasn't until the last 9 games that Frank made him a 25-30 minute player and he played the best basketblal of his career. Unfortunately the changes with oscar's system haven't allowed a repeat of that and likely won't. However, JO is still a valuable player for us, even if he has struggled scoring in in our toughest league games. This season its never going to be either/or with him and Gip, and to have a chance to win the league and make a run in the tornament, we'll need him to play well and score a better rate. And he seems to have adjusted better to a different role and the changes than our fans.