You don't seem to know what you're talking about. Dewey Cooper is only his striking coach. In Vegas, Ngannou trains at Xtreme couture, with Vinny Magalhaes amongst other. When he is in Paris, he is training with an olympic wrestler (HW) and a europe grappling champion (HW too).
And frankly, who gives a shit if Ngannou knows how to ankle pick or land a double leg, he will never need that. What he needs is a solid TDD (which he has), good distance management (which he normally has, but didn't use against Stipe), a good conditioning (which he has), good scrambling from the ground (watch the first Blaydes fight), good submission threat (which he has).
And wtf means talking about adjusments...? he has been given back to back the 2 guys with the most takedowns in UFC HW history and smashed them both under a minute. What else is he supposed to do to claim a rematch? Get an olympic medal in wrestling and win the New York marathon?