Board Thread:Naruto Discussions/@comment-34700383-20180829185752/@comment-34700383-20180902105906

Ive proven that those chakra fragemnts are very small. So much so that Naruto nearly died twice while he still had them. Which establishes kurama as the largest biju chakra he had during the war. So when he taps into all 9 chakra at once, gradually producing juubi’ chakra kurama is still the greatest component of that chakra. So there is no surprise that entering rsm would resembling kurama cloak. Don’t no mistake have juubi chakra for having the actual juubi inside him. Naruto did not have the actual juubi inside, he was simply able to recreate a fraction of its chakra. This is proven by the fact that he could still speak to individual biju throughout the fight with kaguya. So since he doesn’t actually have the juubi inside him, he doesn’t go through the same changes as obito or madara. Still, that produced juubi chakra was his rikudo senjutsu. That’s what his was waiting for and that’s what let him enter rsm.

If he didn’t need the juubi’ chakra, the why wait? Why not use his half of hagoromo chakra to produce rikudo senjutsu and enter right away? It’s simple, he can’t without the juubi chakra.