No, it's because they're better teams. Not sure how Mo has an effect on the game before he comes in, but I'm sure you'll come up with a way to prove it using some mathmatical formula.

And overall, I can't see how he "played himself out of those minutes". I assume you mean offensively, because his defense has been consistantly mediocre since day 1. The problem is he doesn't get plays run for him. He has to get points in transition or off offensive rebounds. He rarely gets shots outside of those things. So when we aren't getting in transition or getting offensive rebounding opportunities he isn't going to be putting up points. It's not like he is bricking a ton of shots. The guy shoots over 47% from the field. He just doesn't get enough shots. His defense isn't great, so if he isn't getting shots he isn't going to be helping a whole lot (other than rebounding).