Some of the greatest PF's of our time can't play defense: Griffin, Love, Dirk, Boozer, even Malone wasn't great man-to-man.
Point is, should Kanter's fate be forever relegated to the bench because of his defense? All of those mentioned above have played on teams that compensated for their weakness.
Two former Jazz bigs (Boozer, and Jefferson) were blamed for our teams horrible defenses, but then went on to play for teams that end up being ranked some of the best in the league defensively. Our coaches should look at how Charlotte has hidden Jefferson (I haven't watched enough of them to know), or how the Bulls have managed Boozer (they did it by helping the helper).
Furthermore, it's not like Marvin can defend the PF, so that means Kanter is benched for the 3 pt shot he's not allowed to take. ?!?!
The handling of Kanter/inability to build a good defense with him in the lineup should be enough not to continue with Corbin.