I think Pop is trying to make certain of what he has. There's a method to this "madness." Had Pop been solely worried about wins and losses, Tim's injury and Nazr's uncertain situation would have brought Sean Marks off the IR as a just in case. Rather than that, he activated Wilks -- I think with the idea of making Wilks a part of the playoff roster. I think he used last night to test that idea -- to be sure that Wilks would be up to the challenge. (I thought he was; for a guy picked up near the end of camp, Mike Wilks has been a very nice find).
I suspect, in a strange way, that Pop gave his team a gut check last night. He wanted to see what they would do in an adverse situation (on the road against a quality opponent) and how much the boys have bought into the system. He saw an opportunity to afford Tim and Manu several consecutive days of rest while at the same time challenging the rest of his team to rise to the occasion. That infusion of confidence could prove very helpful as we move forward from this point, and particularly if the Spurs are faced with having to win some road playoff games, last night could prove pivotal.