I think it depends on what you think this team is capable of. As many of you know I am a bit of a homer. With that said, I still think you can afford to "waste" some wins if you feel that this team is not a championship team. However, if you feel that the team is championship ready, then you cannot afford to "waste" any games and therefore you keep him in no matter what.
IMO by keeping him in there any minutes you are running the risk of making the injury worse. I think you need to bite the bullet and let him go through a full recovery, not a recovery-on-the-fly by limiting his minutes. The fact of the matter is when you lose a star on the team to injury, you are going to have to accept it. And of course having Brad injured at the same time only compounds the situation. But still, if he is supposed to be out 2-6 weeks for example, and then he aggrivates the injury and then he is out indefinitely for 8+ weeks then you are in a heap of trouble. And for what? A few wins here or there? It's not like he is shooting, passing or dribbling at 100% with this injury anyway so get him out, get him healthy and get him back in asap. And meanwhile you open the opportunity for others to step up.