Which...now that I think about it...
DAMN YOU KISHI! YOU DD THAT ON PURPOSE!
eh, at least we have a new question to replace the 4th=AL and 4th=RAL theories.
Personally, i'm up in the air atm. He could easily be Madara. Madara who started then clan, has been mentioned by the kyubii for his "cursed chakra". I also think it a little weird that Obito would become such a god-powerful person such as Tobi.
But i think it could fit Tobi just as easily, he has bolts all down one side of his body, the hole in the mask over the appropriate eye, the same hair style.
it would also fit for Kakashi to die to the leader of Akatsuki (Tobi) and for him to reveal himself as Obito and take back the eye that kakashi had after revealign he gained MS by killing Rin. Mind looking back on what I've said about obito, it think my "want" for Tobito be Obito is influencing my decision here.
Its likely madara :P
Tobi is definitely calling himself Madara in the Japanese version...
So unless Madara is speaking through Tobi, and trying to have everyone think Tobi = Madara, than Tobi = Madara.
I wonder what the hell the original form of the sharingan's strength or Madara's strength is though... That should be the next thing to ask... (my guess would be bijuu union, but that is too lame)
I think Tobi is either Obito or the mysterious unknown sharingan user (maybe the one that Itachi claimed to have killed?) who have gained Madara's power, maybe by absorbing Madara or something like that.
Yeah I can't think of any other reason why Tobi would have a mask with only 1 eyehole. I'm hoping for the 2nd possibility mentioned by kayangelus.
Can someone post the script? Mangahelpers is taking ages for me.
I'm guessing that two eyes aren't better than one. I mean if you had two eyes you would have to use up more chakra than with one eye. And I think that a left sharingan eye should be equal to the right in terms of strength. So why not just have one all powerful sharingan eye.
the chapter is up on onemanga.com
a scanlated version can be found on the MSN group, too, if mangahelpers is too slow.
this is the first time in a while that kishi's thrown a 'plot twist' (if it can be called that, sinc we were speculating it to death already). Also, looks like Pein has some sort of weather-controlling thing going on? Maybe we shouldn't get into that.