OK, being sensible for a moment. Suppose John gets yet another chance, his name doesn't go down as the most monkey's-paw infamous designer in the industry. You still can't manage him.
Do you know why Popeye Saves The Earth got made? Because Python Anghelo had WMS management's ear, could bend it by talking the legs off a donkey and get anything he wanted greenlit. It's probably thanks to Python that King Features still believes Popeye is a property somehow worth umptyjillion dollars.
Do you know why Barry got lumbered with designing Popeye? Because Barry was a leash who got stitched up by no other sod at WMS prepared by then to go anywhere near a lunatic auteur who could not and would not talk no for an answer. Popeye was otherwise all Python, all of the time, and Barry was the poor old workhorse strapped to the front. Even Barry considers it the worst game he ever made.
What happened when Python had no leash, no teammates, no self-restraint and spent design budgets like a drunken sailor? Pinball Circus is what you got. All both of them. (NB: before you shout BUT CAPCOM PINBALL, that was a vanity tax write-off from minute one of its conception to year two of its shutdown.)
John has proven himself over and over since WMS became We Make Slots to have morphed into another Python. That's why you can't manage him.