MacArthur was insubordinate to 3 president. Now that might sound cool, but in his case, it really was't.
MacArthur served under seven presidents. Who were the three to whom he was insubordinate?
I am not sure that MacArthur wasn’t right about the 10th Corps. Certainly if the Marine division had kept on line with the 7th Army division and pushed hard, the dirt where the Chinese concentrated for their Chosin Reservoir attacks would have been controlled by the US. The Chinese would have been discovered while the X corps was attacking, with scouts out, artillery concentrations working, and caissons full of ammunition going forward.
As it was, the remnants of 7th Infantry division fought as rear guard protecting the Marines from the Chinese as the Marines retreated.