What would you change about Marvin?

[McC]

Give Marv total control over everything. Give him final say over all of it, right down to how much a hot dog costs.
Let him run the whole show. Sink or swim. Probably the only way to ever get rid of him is to have him sink the whole ship, which is exactly what he will do. It wouldn't be pretty. It would be painful and agonizing, but nothing else works.

Marv, like many people, found his level. He found his ceiling, which is bad team rebuilder. He is incapable of going any farther than that. The rest of the journey, the last leg, the last mile to champion is his bridge too far.

What I would change about him? His refusal to recognize this and move the **** on.