Response to Critique of Naruto Theory, also more theories

As you can see from this page from Chapter 386: the Mangekyou Sharingan REQUIRES killing one's friends. Thus, it cannot simply be acquired by means of vigorous training, as the critique of my theory implied. HOWEVER, this image does seem to invalidate my previous theory regarding the identity of Pain. I said that Pain had something to do with the younger brother of Madara Uchiha; we know that Madara stole his nameless younger brother's eyes, but I wasn't clear about his fate AFTER that. But it appears that, according to Itachi, that brother died as well ("And killed their siblings to make its power permanent!"). Thanks for the thoughtful critique! While I'm in Naruto mode, here are a few other theories: 1) I theorize that the reason Itachi was so easily defeated was that he didn't really want to fight his younger brother. He was "put up" to the task by Madara Uchiha. Thus, Itachi lost despite his superiority; his final gesture, the poke to the forehead that used to be an expression of "sibling affection" (?) was actually sincere, and was Itachi's way of telling Sasuke that, in the end, he actually did love his younger brother... Madara Uchiha, meanwhile, set the two brothers against each other, not caring who would win. Whoever did survive would be the next candidate for an "eye transplant." That, apparently, is where Madara and Zetsu are headed next. Before the black Amaterasu flames can consume Itachi's corpse and Sasuke's exhausted form, the two Akatsuki members will show up and steal Sasuke (AND Itachi's ring!!! Remember, that's what Zetsu always does, as a hunter-nin!)... 2) I STILL think Madara had something to do with Pain's creation. Of course, it is said that the Rinneigan originated with some mysterious "Sage of the Six Paths," but why is Pain subordinate to Madara then? It's interesting that "Rinneigan" seems to be translated as "Reincarnation" Eye... a kind of Buddhist theme...