However wouldn't the requirement for not sending Stillwell essentially be having someone else (and like I said earlier far more wary of communism in general and the Soviet Union specifically) than Roosevelt to be president at that time??Or failing that at least having someone else than Marshall as chief of staff as he was the one that actually made the recommendation?
FDR didn't select Stilwell to be sent to China. Secretary of War Stimson initially asked Hugh Drum to go. Drum was the initial front runner to become US Army Chief of Staff, but FDR picked Marshall. Drum had some reservations because he wanted an actual command and feared that the assignment was only as a military mission. Stimson's words to Drum always indicated that the assignment would be a command, but when Drum talked with Marshall it sounded more like a mission. Drum's attempts to figure out what the assignment actually entailed made it look to Marshall that Drum was not interested, and it was taken away from him even after he said he'd go. Instead it went to Stilwell who didn't want to go anyway, but didn't want to refuse a command.
So if Stimson, Marshall, and Drum communicated better, Drum could very well have been sent. Or if Stilwell simply told Marshall, I'll go, but I'd rather command this Operation Torch plan I've been working on, then yet a third person might have been picked.
Here's a though, could Mac Arthur have done a better job in China perhaps to the point of saving the nationalist government than Stillwell?
MacArthur had a lot of strengths and might have done a better job. Most of Mac's failings as a commander had to do with him neglecting his duties when complacent (Philippines in late 1941, in Japan during peacetime, Korea after Inchon). During actual wartime when focused on the job, he did very well. Mac would certainly have no truck with the Chinese Communists, and he would have had the political skills to deal with Chiang and understand the actual situation in China. He also would have worked much better with his fellow commanders, which Stilwell often couldn't.