Two reliable sources are reporting that Greg Robinson is indeed the guy at defensive coordinator; unless there's an unexpected derailment an official confirmation should come sometime soon. (Bonus, ethically dubious confirmation can be found at Maize 'n' Brew, which relays some goings-on at the premium sites.)
I've said my piece on Robinson already—in a word: yikes—and am pretty skeptical of the hire. However, I am not a football coach or even that familiar with Robinson's work except in a macro "holy God what happened to Syracuse?" sense. Rich Rodriguez is, and he's basically gambled his career on his future performance. All hail Gamblor!
Also: Michigan might not be done searching for coaches. LBs coach Jay Hopson is apparently searching for a job closer to home, further proving that nothing escapes Mississippi's inexplicable gravitational pull.
Yes, this would make it a seriously uphill battle to retain the services of either non-enrolled DT commit.