No one should be able to stand against someone with the Rinnegan without having an equal amount of Rikudou power to stand against, but that's not the argument. It's not even about Sasuke here, it's whether or not Full Kurama doubled Naruto's power, which it has shown to do. Hell Naruto fought against Toneri's Rikudou cloak, and TSB's with only Full Kurama BM with Sage Mode. That's enough to prove the point.Really? So Naruto can solo Sasuke with just his Kurama mode? Because that's what should happen according to you. I wonder why Kishimoto would say they were on par when he using it then. I guess he just doesn't know his characters.
The Last? How did that prove anything? 697 Naruto could recreate those feats. The only thing new was his Chakra control. If anything the Last Naruto got weaker.
His mastery over the Tailed Beast is something grand, especially when compared to the Naruto who far in the War Arc. He was even shown being able to fly without an ounce of Rikudou chakra in play. I don't call that lack of mastery for nothing. There's nothing about "The Last" Naruto which is weaker than post-Rikudou enhanced Naruto, which is what we were talking about originally. Obviously Rikudou Sage Bijuu Mode Naruto would destroy the Last Naruto.
War Arc Naruto before being Rikudou enhanced would be destroyed by Hashirama, the Last Naruto defeats Hashirama. It's pretty obvious how strong he became in those two years, and that's without RSM activated either.