What you said about Madara could be true. He did say that it has been a long time since he has seen this view... referring to the after math of the meteor hit. But that could just mean any huge war field full of dead ninja etc. So I thought he used the meteor move before but it would make sense if he has not.
And the fact that tobi might want the uchiha and senju powers from this generation from naruto and sasuke fighting... that could more then make sense and I like your theory a lot! It would be better then the uchiha and senju are made to fight eachother bla bla bla.... boring and stupid. Tobi just wanting them to dual JUST because of the past is annoying.
RockmanJ you said this... Also, the combination of senju+uchiha= rinengan makes a lot of sense.
It's been obious for a while that there is defiantly some type of relationship that goes along the line of senju+uchiha= rinengan but it's very confusing. Been many people who seemed to have both DNA's and still have not obtained the rinengan and then there are people who have had the rinegan without perhaps having both DNA... Nagato. But I would have to go on forever to even remotely touch into this discussion. And I will admit it that I have given up for now about speculating about the rinegan. Every chapter that mentions the rinnigan just totally changes a lot of my opinions and theorys.