Jerry answered this question not so long ago, and I believe him.
He does not participate in game planning but wants to be briefed on it each week, and will occasionally say “I’d like to see more of this, that, etc.”
Whether that’s a problem or not is a matter of opinion.
I think the GM certainly ought to know what the game plan is for each week, but when the guy who the players recognize as the main guy isn’t the head coach, I can see how it can affect the latters ability to command the locker room, although I don’t think Mike has done terribly in that regard…considering.