AT VOTE 2 sasuke used all nine bijuu and his Rinnegan to create a humanoid ten tails susano'o. Naruto on the other hand just created three Kurama shadow clones, fused them together probably using chakra manipulation, and boosted it by having another kurama clone gather nature energy, no Rikudo chakra invloved. So that leads me to ask did naruto ever really need RSM to defeat Sasuke?