I like Grant, but am not sure why he is seeing so many minutes early on. I guess the explanation is that he often used as a Center so when Theis/Time Lord return, he could see his minutes dwindle.
I know people around here have been raving about him and he is a great glue guy, but sometimes guys need more time to integrate into the NBA. I agree with gouki, too, that he operates best out of the high post.