This is his only option.
If Manny wants to be a successful CEO and head of this program, he needs to focus 100% of his energies there—not playing some on-call role for an in over his head defensive coordinator that is some sort of protege.
Butch Davis is a defensive-minded guy. He hired Bill Miller in 1995, who'd been the defensive coordinator at Oklahoma State for six seasons—turning the reigns over.
Miller was out after year four; after Miami gave up 66 in a loss to Syracuse and 45 in a win over UCLA—Davis bringing in the then-unknown Greg Schiano, who was know for a more attacking-style defense that he ran at Miami the next two seasons, before getting trapped for the head coaching gig at Rutgers.
In short, whatever Manny was as a defensive coordinator—he's a head coach now and his job is to play CEO and put the best people in position to help the Hurricanes succeed.
We'll see what he has the cojones to do this off-season—but it starts with punting on Blake Baker.
My two cents; go get Charlie Strong—who is wasting time as an "analyst" under Nick Saban at Alabama. Strong failed in his past two head coaching gigs, but is a solid defensive coordinator and a **** of a recruiter in the Sunshine State—not to mention, a guy that has actually been a head coach at three different places.