Let me give you a hypothetical.
Late in a game, McD tells him he wants to play it a certain way. He has earned the right to, basically, say "screw you", and do what he wants?
I don't think so.
Another hypothetical. Game week, and the HC wants to employ a certain game plan, in an attempt to take certain things away from an opponent. VD has earned the right to ignore his instructions, and put in a different game plan?
Again, I don't think so. That sounds like a Mike Ditka/Buddy Ryan situation.
It isn't going to work, and VD has to acknowledge and understand that, particularly being an ex-HC.