MacArthur NEVER secretly went behind Truman’s back to meet or call Chiang Kai-shek in opposition to the nations policies. Truman’s differences with MacArthur were quite public and MacArthur has been proven correct. Truman, not so much.
It seems I recall that MacArthur wanted to take the fight into China.. He may have said something to the effect that he already had the equipment and manpower on the ground so why not finish the job.. Truman disagreed.. (?)