Just a theory but this is seeming more and more like a "dread pirate Robert's" personality. (hopefully there are people old enough here that get the Princess Bride reference)
The original masked attacker was Madara. This satisfies the questions of how come the masked attacker was an adult during the fight with the 4th hokage. Years after the kyuubi escape during 2nd ninja war, when Kakashi took the eye from Obito, Obito was found and saved by Madara. After being healed Obito was trained and raised by Madara after finding out about the death of Rin (hence him growing and reaching an elite level). This solution also satisfies the comments that Tobi obtained "his eye" during the battle of the bridge that made Kakashi famous.
As to why Obito is mad at Konoha and Kakashi, it is because of the death of Rin, whom Obito loved and cherished.
When Madara eventually died, Obito assumed the persona that Madara had developed and gave himself a new name, Tobi.
I believe this is the best and most likely solution for what has been going on. Any comments would be appreciated.
Honestly I think the person that fought the 4th
Hokage was Zetsu, Remember that it can copy the
person justus and look exactly like them. Plus
when he fought the 4th and he got hit with the
rasengan his arm fell off. That pretty much throws
that out the window saying it could be mardra.
Basically what you just did is make up a bunch of
situations that suit what you want to believe. The
only thing that i want to say back to you is why
would Madara attack the village and the fourth
hokage and hold back? Riddle me that. When tobi
fights the fourth, he uses none of Madaras tech.
Also Madara was supposed to have the rinnegan
after the fight with the first. Tobi didnt use the
Good point. After seeing
what Madara can do like fight the five current
Kages and make it look easy... and can shoot
meteorites down from the sky he is pretty
powerful. He would be a formidable opponent for
the 4th even if he is still weakened from his
fight from Hashirama. Also, how would he know the
space time ninjutsu if he was Madara.Maybe thats
not the best reason but i think the space time
ninjutus that tobi uses is unique to Obito and
according to your claim Madara would be able to
use this tech.
I forgot that if
Obito was Madara's student during the time of
the Kyuubi's attack do you think Obito would
let him attack Konoha which contained his old
master, friends, and clan. I don't think
Obito would do it and who knows if Rin was even
dead at that point. You have to know when Rin dies
to make revenge a possible motive for Obito
turning into Tobi.