It seems almost certain that he would have been in the units that were in Operation Downfall--and I might never have been born...
My Dad (also served in the Pacific) was likewise told that despite being temporarily sidelined from a sniper shot that got him in the arm (that was in ‘44), that he would very likely be participating in the invasion of Japan as well, which is why 99.99 percent of our soldiers in the Pacific said “God Bless Harry Truman” for having the guts to drop the atomic bombs.