Board Thread:Theories and Speculation/@comment-26907071-20150819192420/@comment-734582-20150820123600

I just want to point out actually, that Kakashi could've made a good pawn for Madara too. Madara possessed the Gedo which could sustain people, so if kakashi got crushed in stead of Obito, he could've been healed in stead of Obito. Madara also possessed numerous Sharingan, so he couldve implanted Kakashi with two. We know that Obito getting Hackirama cells granted him nigh-infinite Mangekyou uses. So Kakashi being healed like that and getting one (and maybe later, a second) Sharingan, then doing the Rin rescue could pretty much have reversed Obito's and Kakashi's roles. Kakashi was already broken at this point, unlike Obito who still had to be broken.

The biggest difference is that if kakashi (as a potential alternate) would've gone to save Rin, and Obito killed her (there's little reason to believe this would've gone that different), there would probably be 3 Mangekyou (with kakashi having his own), but most of all Obito would've had double Kamui of his own. As a result, Obito would be a significantly stronger ninja than Kakashi, and probably would've been strong enough to take down Orochimaru in Part 1 or even "evil Kakashi" during the Kurama incident, possibly preventing it entirely.

A third alternative is that Obito never awakens Mangekyou. All in all, i think there's little reason to believe that if Obito didnt save (or have to save) Kakashi, the world would be that different.