I don't know. He is a step behind on almost everything. Even in tonight's game he was picking up a lot of fouls trying to react after someone got the step on him. Fortunately, the refs didn't call the last couple fouls on him or he would have been gone early in the 4th. That one crucial play where he held Pau in place so that Rondo could get an uncontested layup was huge.
I don't question his heart or desire to win, but he has not inspired enough confidence these entire playoffs in terms of his physical abilities.