Madara and The Tobi's
manga says before madara died he achieve his rinnegan
when madara knows his time is near he searched for someone who can used his rinnegan and find this uzumaki which is the young nagato.
izuna, having no eyes still continued fighting that war with his big bro. and said to be died
or maybe missing, and saved by someone
If madara had a son or a direct descendant(if izuna had a son too) he maybe give his rinnegan to him not to nagato.
but Kabuto didn't find any dna or trace from izuna that hope to be used on his ET
if izuna is also saved by someone during the first shinobi world war, i think it's Zetsu who saved him and then they form the Masked Man.
Did anyone else noticed that kamui used by the Old TOBI and The Present TOBI(obito) is different kind of Kamui that Kakashi's using? i mean different approached.
Kakashi's kamui can on only be cast to someone or something, not to himself.
Tobi's Kamui can only be cast to himself and what ever he's handling.
Obito's right eye(crushed) could be seriously damage and cannot be used.
TOBI's right eye could be from the uchiha who is related to obito.
we dont know obito's family yet, he may come from one of the genius uchiha out there like itachi's family.
that's why they teamed up with
Minato(sensei, konoha's yellow flash,4th hokage)
Kakashi(son of the white fang who said to be treated like the legendary sanin's)
Rin(Prodigy in Medical nin)
then why they chose Obito? even seem to be a stubborn kid and a crying baby.
so there's really special aside from being uchiha but on his immediate family.