Lol, no need to get so upset with Obito theories. At the end of the day, it's just a manga, where all kinds of crap can happen, actually
have happened. It takes all kind of different people to make up the world, thank God we're not all the same. I for one love seeing what's on people's minds, it's beautiful and at times a very funny thing. Like the Sasuke from the future theory, wouldn't call the person who thinks so stupid, it's fictional lol. Not to mention there's children on here..
Also, so what if a person is "retarded" (This seems to be the popular word when one doesn't think anothers theory make sense) or not as intelligent as most, what's the big deal?
And anyone who calls Obito theories stupid clearly isnt looking at the bigger picture, you guys act like there's absolitely ZERO reasons for believing so.
ugh ... that's not what the chapter and dialogue has suggested at all.
use brain, Tobi has intel on everyone, had Zetsu as a spy and met Kakashi before.
So during this meeting with Kakashi and Tobi, Tobi found out that Kakashi lived his life in regret despite Kakashi not saying or even hinting anything about it.

I don't see how that meeting can even be considered relevant.
And the guy is right, it does
suggest that it's someone that Kakashi and Guy knows. To think that Zetsu spied on Kakashi or something, is your own way of trying to make sense of "how he knows about Kakashi and Guy".