Ok fine, let's get this to the hottest thread section..... I'm not disagreeing with ya man, I said you brought up some valid points. Senju and uchiha, we know they derived from the two sons of the So6P, right?
Ok good, therefore it makes sense for them to be PARTS of the sage, only parts!
Now my point, where does Nagato fit in with sage? Other than the fact that he is part senju, and HAD the SAGE'S EYES. If that's the case, then he wouldn't be the 3rd path, he'd be the first alongside hashirama.
Now, I'm not done yet, but like I stated earlier, you brought up something very interesting, something that makes me wanna go back and research a little more. Cause you might really be on to something.