I don't think the rippled-pattern eyes (Rinnegan) can be obtained from having the Juubi or becoming its Jinchuriki. Take the case of Nagato and Madara. They awakened that eye even without the Juubi in their possession. I believed the Rikudou sage already have that eyes before he became the Juubi's host and its awakening requires more than acquiring powers from both senju and uchiha's thru DNA, blood, cells, tissues or whatever process, and experiencing despair just like what happen to pain. I believed there's more.
Based on the anime (because i didn't read the manga from the beggining), Rinnegan is a rare ocular power. If those were just the requirments for obtaining this ocular power plus if the speculations about the Rikudou sage (ancestor of senju and uchiha) being an Uzumaki is, for instance, correct. Then anyone of Uzumaki's clan can awaken the Rinnegan as long as they experience despair, which is somehow contradictory to the statement that Rinnegan is a rare ocular power.
And... if, for example, the last sentence above is true. I don't think the Uzushiogakure of Uzumaki clan could be wiped out that easily even if we say Madara is behind the assault on the hidden village of Eddy based on theories u have deduced, Sir. Are you saying that the destruction of the hidden village of Eddy happened before Madara and Hashirama battle to death? It's still not convincing enough because it is not stated in the anime that the assault on Eddy village happened during a war. I watched the anime many times but I'm not also sure about my conclusion because I may have overlook some details that's why I'm clarifying this to you if it won't bother you
By the way, thanks for sharing your idea. I enjoyed reading it. It took me more than an hour to analyze your theory. U have done good job and i think your judgement is fair. THANKS!