I don't think people realize how tough a spot Corbin is in. How many other teams have their 2 best (arguably) and highest paid players that are veterans and also have the next 2 best players (arguably) in their 2nd and 3rd years coming up right behind them? Its hard to find time for 4 guys who should all be playing. Jefferson is basically the only player that can score 1 on 1, Kanter is getting better, Favors is very very weak offensively but is a very good defender, and Millsap tries really hard but is just to small to be a great player. They all have strengths, they all have weaknesses. Its a lot deeper than Jefferson sucks at D and is boring he has to sit. Its not that simple.
I do think Marvin should have been sent to the bench along time ago, and Burks has proven us naysayers wrong. Mistakes have been made, but Ty is not in an easy spot either.
To be honest I do not care how hard of a spot Corbin is in. He is paid millios to coach this team. Not make friends or coddle players.