you got it all wrong guys...so here's teh explanation of me teh creator of tobidara theory :
1-tobidara exitence is a fact and not a theory...if you know that kisame and itachi aren't dumb stupid to call tobi madara..especially kisame who saw madara's face twice and always called him Madara..
2-BUT !!!!.......... how tobidara came to existence or better said why do we have 2 Madara's runing around at the same time,is teh theoritic part Tobidara....wich is teh missing piece of teh tobidara puzzle for these i proposed 2 theories :
A) teh empty shell voldmordic theory : tobidara to Madara is like teh empty shell of Juubi to Juubi himself....Tobidara is just an empty shell of teh reall Rinne-Madara...remember?? Edo-Madara spoke about his Body secrets engraved inb teh uchiha stone...
tobi-Madara is like voldmort and Obito is his horcrux....
Madara was never dead...and teh rinnetensei reviving edoMadara isn't a proof that Madara was dead...becuz the true goal behind rinnetensei was TO REJUVENILE Madara's body and not revive him...
befor old Madara died he left his empty shell sealed inside obito controlling him....
Tobidara is the consiouss living archaic weak vessel of Rinne-madara....and in chapter titiled "THE NIGHT BEFOR KAGES SUMMIT" Tobidara told black zetsu : "i cant believe nagato used his rinnetensie like dat , it was suposed to be used on me"
-notice well when rinnemadara was revived he was very happy to have his new vessel rejuveniled through rinnetensei....this confimes that tobidara was right to have his reall vessel (riinemadara) revived...
B) the Izanagi theory : when Madara fought hashirrama he wasn't dead...instead he was in momentary death just like when zabuza did that....what happened is a glitch in the izanagi jutsu...because izanagi was suposed to revive a dead Madara and because the Madara who fought hashirama was in a momentary death, the izanagi still worked and created a new Madara...
why the izanagi theory could also be true?? because when tobidara told konan about his true ID he mentioned izanagi and related it with his reall ID to be Madara...
notice well that tobi had no reasons to lie to a dead konan..