Great hearing that his hip is feeling great. Hope he has a healthy and productive season.
As for talking max money Isaiah's best option is to shut up! Too many people are struggling just to make ends meet. He sounds like he feels entitled. If he's worth the max, then let his actions will prove his worth, not his mouth. His agent needs to talk with him.
If I remember correctly Sport Illustrated (or some other news source) wrote that, when his overall play is considered, his numbers didn't equate to being anything special. Plus, his playoff performance against Cleveland in the 2016 weren't anything special either.
This past year it was noticeable that more teams were doing a better job keeping him in check. Thus, he's a liability at times because he's shooting too much. He needs to focus on basketball and not comment any further to questions on his future contract.