Judging by Devin Gardner's brand new display picture on facebook it looks like M-Rob is a silent commit. It's JJ, M-Rob, Gardner, and Ricardo all wearing Michigan gear at the Spring game. So based purely on speculation I'm guessing M-Rob is a silent commit.
"He makes it really easy on you as a coach because he has tremendous football instincts," Michigan tight ends coach Jay Harbaugh said. "Things come really naturally to him. He doesn't have to see things too many times. He has a good sense for how things should look and feel, and he's a tough, physical guy."