Agreed on King and Eisenhower, and I'd add Nimitz to the list. That said, MacArthur... wasn't the best we had. He was kept in place for reasons similar to those that applied to McClelland (keeping him out of the presidential race).
Also agreed that that's the way to step down.
But now anything that goes wrong is on Zelenski - which has always been the case. Let's hope that doesn't cause issues for the new CinC