There was no point of keeping it. Obito might give him the left Rinnegan. Anyway there was some thread that predicted that Madara will have Kamui with Obito's right eye but it turns out it was actually going to be Kakashi.
So it wasn't just Senju DNA to get Rinnegan. It's just by the specific reincarnation? So this means Sasuke needs Naruto's Uzumaki DNA if he didn't meet the sage?
He acts like Goku with that Rasengan spam or Rasenshuriken spam. It'd be awesome if he can use a lot of pro wind techniques. If he has water as his 2nd element, would it be possible if he can pull whirlpools? I mean that's what Uzumaki means right?
I think the next filler should be about either Minato when he was a kid and if he met Kakashi's father or a filler on the 3rd hokage as a kid and then to the point where it shows his first day as hokage.