Really good and happy as a starter. Un-motivated and pissed off coming off the bench. Would you perform well at your job if you got a heavy demotion? Keep in mind 2 years ago he was within the leagues top PF for double doubles. And he was just filling in for Boozers injury. Favors will be great, but he has a ways to go. Kanter will be too, but he also has a ways to go. Neither is starter ready, so why replace Milsap right now, other than too clear Roster space?
My point is that if the other big men pass him, and then he's unwilling to take a 6th man role, then he has to go. Right now he's ahead of Favors and Kanter, but for how long?