1) thanks!
2) 4th Hokage was a Senju. That and Tobi mentioned him being Senju when he and Naruto met in the cold if I remember right.
3) Not surprised, I think its the only realistic outcome.
4) Like I said, i MIGHT go as far to say it. Just a random thought, pretty extreme I admit.
So, we already know that Rikudou sennin passed on the eyes to the uchiha, the body to the senju. So, where does the Uzumaki clan fit in with the SO6?
The Uzumaki clan is known for its strong life force and sealing techniques, leading me to believe that they inherited the spirit of Rikudou...