so saying "kabuto managed cause of karin cells" is wrong...orochimaru had 1st cells...you cant beat that :P
having that said, naruto could be a sage even without uzumaki blood line and tame kyuubi without uzumaki energy (like all other jimchuriikies)
so we get back to the point that so far we have evolution to the eyes and nothing to the body
naruto using kyuubi and sage has nothing to do with being in the body team
Its too late in the manga though for Naruto to develop the perfect body, the closest he has gotten is Sage mode and he apparently perfected it. Jiraiyas SM was incomplete which would explain how he lost his arm. Weve seen Naruto do ridiculous things in his SM but i dont see him having an unbreakable body.
The Sharingan seems to be the perfect eye because it is utilised by Superior Shinobi e.g. Itachi.
I do agree with you on the Rinnengan though (never really thought about it until now)
i agree than its up to the shinoby, but with some limits here
like stated in a series
an expert with a rock will beat a novice with a shuriken but....on this situation sharigan does everything
-increase effectiveness in ninjutsu (learning new spells, use them more chakra wisely)
-making you reach your personal top taijutsu (well, you see everything slow motion)
++ the imba jutsus (susano, amaterasu whatever)
and the "strong body" well...its just physical strong
why i would like to see (which i doubt i ever will)
opened gates with sage mode, so the sage mode protects user from the sideeffects of gates
How come Sage mode save user from the side effects of opening gates ???
and again, i would like to ask it one more time. where it is shown that Orochimaru had Hashirama's cell?
On a serious node, Karin isn't developed eough to impact the story at this point, unless kishi decide to give her spot light for some chapters and then deciding to be deemed useful by any villian.
opening gates, pretty much, increase the flow of chakra and blood to the ammount that it damages the body
so possibly ( i doubt we will ever see them both) it will prevent user to take inner damage
But Karin is a living Uzumaki and much more vulnerable then Naruto. It could be taken major advantage of.