Well that is great theory and Although I believed more in Sage of six paths obtaining Rinnengan after becoming Juubi Jinchurki due to Suffering concept... even still believe in that then I see a very high possibility that Sage of six paths obtained Rinnengan before becoming Juubi Jinchurki due to Suffering brought by endless wars, time of chaos.
As I said I see equally possible your theory and Sir Derp Obito's with Sage obtaining Rinnengann after becoming Juubi Jinchurki...
If you are right then
Obito statement about Sage of six paths becoming more then human and being hailed as God after becoming Jinchurki is contradicted..., but If Sir Derp Obito and belivers of Sage obtaining Rinnengan by becoming Juubi Jinchurki are right then
Jirayia statement about Sage of six paths that he was sent by heaven in time of endless wars awakeining Rinnengan to become Destructor or Protector of The Shinobi World is contradicted as well
Now it is question who was wrong ?!, Who is more credible Jirayia or Obito ?!
Moreover you
countered The most important argument used by Sir Derp Obito that
Rinnengan is translated as "Eyes of Suffering" that mean can be
awaked by suffering and Sir Derp Obito interpreted it as
Becoming Juubi Jinchurki, while you interpreted is as
Suffering in time of chaos and endless wars of mankind. It seems that both theories can same or close to same amount of evidences/clues to back up them, so for now I say they
HAVE SAME CHANCE TO HAPPEN
Either way, it is awesome theory
Great job

, I am really excited and can't wait for Sage of six paths appearance in Manga...
For me it is the most anticipating moment in manga and I believe for most of the people as well...