Interesting theories! I think I'll go with number 3 because it seems plausible.
I do have one thing on my mind: SO6P's sons being created with COAT; what intrigues me is the fact that we have an older and a younger brother. Did the Sage created one and after some time he said to himself that 2 is a nice number? I personally don't think so...I think he had a wife and they got it on xd
despite my opinion, your theory might be true viewed from a certain point: the Sage created his first son, saw his lust for power and decided to create another one with the hope that he'll try and bring peace through love.
I'm not Kishi so who knows...maybe you're right.
Great thread!