If Kishi makes Naruto become the SO6P...Not the son...But the SO6P himself...What about Sasuke

How is Sasuke suppose to be on par with Naruto then?!?
This is why I think neither becomes the Rikudou Sennin, or at a reason, and I think that they are only reincarnations of the sons, just as Hashirama and Madara were. I don't think anyone will regain the full power of both the eyes and the body of the Rikudou Senin, unless perhaps it's the very end of the story when everything is settled and none of this matters.
While any of this matters, neither will obtain completion, and perhaps that's what the Rikudou Sennin wanted, as he left his will to the younger son who believed love was the key to peace. Perhaps the father believed both power and love were necessary, and realized he was wrong, which was why he told the Bijou that one day that they would be reunited and led down the right path by another (who is now Naruto, a reincarnation of the younger son)... Who knows. :shrug:
Either way, don't worry about Sasuke, he'll stay on equal footing with Naruto as long as they battle. They always have, and I'm certain that they always will despite the fluctuations along the way. Granted, I do not know everything mind you, lol.
Peace