Continue reading here (I didn't write this, but it is interesting and well explained)
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the elder son has been raised to number 2 after reading that, but i feel its still izuna. a lot of what is said in that thread can be linked to izuna as well.
Lets see.. He was pulling the strings all the time and manipulated many people, yes, he did have large impact.
what strings? there is no evidence of this in the manga. again not much is said about the elder son besides him being the more aggressive descendant.
Yes. I already mentioned before that this personality rather fits to the elder son than Izuna. He elder son believed that peace could be achieved through power and strength. Tobi also does thinks this way.
this is one reason why ive moved him up in my list. i dont agree with the personality thing yet, but the manga stated something along the lines of "peace through power and strength" at some point.
If Madara says he is dead, he is dead. There is nothing to discuss about.
we have seen many people in naruto die and come back - oro is the most recent example. even madara is HUGE example. he was dead, and now hes alive again. as i said before, it is POSSIBLE that madara could have revived izuna using edo tensei himself and showed him how to release it - which is how madara knows how to release edo tensei.
again its all speculation of course...but your guess is as good as mine.
Let's see... the greatest mystery in this manga is just a random Uchiha whose only job was to give his eyes to his brother. Nice story writing... I am impressed...
...
See previous point
being madara's brother, and the person who helped train him, isnt just a "random" uchiha. i find izuna just as interesting as the elder son...well not quite. since i believe tobi = izuna, i find izuna more interesting.
but to your comment i could also say this:
"Let's see... the greatest mystery in this manga is just a random Uchiha [the elder son] whose only job was to create the hatred that exists today inside the uchiha. Nice story writing... I am impressed..."
Okay, he might actually fit. But I doubt it's him.
yay

we all will have our belief until someone provides unarguable evidence or the manga says it.
He is the final villain. I am sure he is.
i still prefer a combo of madara/tobi/oro as the final villain and then naruto and sasuke save the day - together.
No. This is actually a good question.
if it turns out to be obito - that is the worst way to do it. just like how you dislike the izuna theory, i dislike the obito theory (at least as it is shown currently). the eye helps the situation, but if someone tries to prove tobi = obito saying their names are similar, ill just have to do this: :sy:
So? How could he know about SO6P, his sons, the bijuus etc. etc. ? He DOES lack knowledge, also skill. Tobi seems to have great mastery over Sharingan. Controlling Kyuubi using standard Sharingan is imho not something that Izuna could be able to do.
my theory for the knowledge of the past and everything is what was written in that uchiha tablet, which is supposed to be secretive.
you said "mastery over sharingan". who is the most feared uchiha in history that we started this war? (Madara). who trained with madara (on equal level as far as we know) and was second in command to the uchiha clan in the past? (Izuna)
read my question below. controlling the kyuubi is a good point you bring up. ^^
Oh... this is all. Just reviving Madara. So Tobi controlled that many people, founded Akatuski, exterminated the Uchiha clan, etc. etc.. just to revive his brother?
when you say it like that, yes it makes my point look weak. xD but in the link you provided to the other forum, the elder son could have more reasons for this war, but izuna makes more sense (to me). again i have the elder son as second on my list now but izuna is still first.
i have one question after going back and reading a few chapters:
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(sorry for posting manga from a different site, but the manga from here wasnt loading for some reason).
why does the kyuubi know "madara's chakra"? didnt tobi control him? this may prove it is more the madara/zetsu clone than anyone else. it definitely doesnt point to it being the elder son. if tobi isnt madara, why is the kyuubi able to know he was controlled by madara - especially when madara tries to summon(?) the kyuubi?
this is just a question, i dont believe tobi is madara's clone. but maybe if tobi/madara are related in someway

maybe their chakra might be similar - not sure if chakra of siblings would be similar.