You see the man in the picture there? That's Michigan's defensive coordinator Greg Robinson, and boy does he have his work cut out for him.
Let's first look at what we do know about the Wolverines' defense. They were less than spectacular last year (yielded 30+ points in 7 games), and lost three of the most important defensive players to the NFL (Brandon Graham, Stevie Brown, and Donovan Warren).
And it doesn't end there.
Arguably their best and most important remaining player in the secondary (Troy Woolfolk) will almost assuredly be out for the year with a dislocated ankle and broken fibula in the same leg.
Add in the fact that Michigan will also be without J.T. Turner and Demar Dorsey, each for different reasons, and you have a defense that is thin, inexperienced, and in a state of flux.
That's not a recipe for success at any level.
What we don't know at this point is who will step up and fill the holes left all through-out the defense. Obviously only time will tell who will step up, but for now, let's take a look.