DVD wants to be in Miami
Mario knows DVDs recruiting value and wants him on staff
Mario wants the best for DVD
All of these could exist and it could mean that DVD leaves for 2ish years and gets more coaching experience and when he's ready to be an on field coach as a CB coach at a big time program he can come back to Miami.
Another scenario is Mario gets an elite DB coach like Raymond on staff, promises DVD that he will mentor him for 2ish years or so while DVD stays in an off field role, and then promotes DVD when he's ready.
I'm just saying Mario can't just make him a CB coach if he's not ready. It's too important of a role. And what if we bring in a new DC that wants his own CB coach?
The good news is we know Mario knows DVD's value and DVD wants to be in Miami.