I don't know what any of this means but for me it's simple. When what you are doing isn't working change the things that are easiest to change first. Coop isn't going to be here for the coming rebuild anyway and the team is stuck in neutral and has been for years. Take a shot on a new voice and some different energy. What does the team have to lose?I don't think you were representing it as fact, that is why I said "coulda woulda shoulda".
I am pointing out that since it isn't a fact, which we both agree, that your what if conjecture with respect to other coaches potentially doing a better job could be entertained with some supporting evidence. This is where I think that rabbit hole ends though, because he's had tons of success at basically every level, he's built himself up a robust set of plot armor.