Originally posted by BazookaMasterTechnically Atton never beat Sion, that was in cut content. While I personally think it should be canon, as far as a debate goes; if it didn't actually happen then it can't be counted.
Darth Sion was near immortal and held his body together indestructible after suffering many deaths, punching a hole through Sion is a greater feat than punching holes through battle droids