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.
Also, for all of you commenting on Obito's
age and appearance being an issue... Remember that
he got crushed by a giant boulder and then that he
potentially got crushed by numerous smaller rocks.
It wouldn't be surprising if his body
retained a shitload of scars, enough to make him
look older than he actually is. This is even more
likely since we haven't seen his full body
yet. We've only seen a small percentage of
what he actually looks like. What looks like age
could be a tremendous amount of scarring and
permanent damage to his body.
sorry bro not enough evidence mayber you're
right but fact is if tobi wanted revenge on
Kakashi wouldnt you think he would just kill him
and how about this moon plan of his being the real
Madara was revived and still in place im pretty
sure if he selected tobi to be his student he
would double team to kill all the kages and
capture naruto and the eight tails since Madara
has the Rinnegan just saying thou
Can I just get a second to say "I told you
all so". I was right about Obito wanting
revenge for Rin. About Obito/Tobi being the
apprentice/associate of Madara. Correct about
Obito taking over the Madara personality after the
death of Madara. And most importantly, I was
correct about the princess bride reference, Tobi
really is the new dread pirate Roberts...