Re: If Sasuke fought Kabuto without Edo-Itachi...
Yeah, just like he raped Deva path with his sage mode, and without completely getting taken over by Kyuubi to defeat dying Nagato's final path. Oh wait...
There's so much fail^^^. First off kabuto is not weak, he never was. He was always a highly skilled and highly capable ninja, and was said to be on kakashi's level...with all of orochimaru's power + sage mode he's even stronger. To say Naruto would be weak without the kyuubi is also dumb, he could totally rape hebi sasuke if he was in sage mode(hebi sasuke also had cursed seal, and orochimarus power...so its not like he was always fighting with his own power). Naruto earned the power from the kyuubi, its the hardest tailed beast to control and he did it. Don't act like current sasuke has power of his own either...he didn't gain EMS by himself, it was given to him by itachi. If it wasn't for itachi sasuke would be fodder compared to everyone
Kyuubi is an entity, Sharingen is an Uchiha ocular ability. If it is passed on from one family member to another, then it is done to eliminate Blindness that comes from MS. It still remains within the clan in a give and take manner, as it's THEIR own bloodline ability, not a borrowed one, like Kakashi's who is basically famous for his copy 1000 jutsus from an Uchiha eye; funny.
Kurama is a completely seperate being with its own chakra, feelings, thoughts; it is a living breathing separate entity. You cannot even compare the too, so this logic of his isn't dumb, you are obviously unable to pass the basic ability=/= entity logic through your head. Do that please.
And I would LOVE to see Naruto rape Sasuke other than your assumptions.