Guys you should know that the true tobi is UCHIHA MADARA...or better said the 2nd madara manipulating obito..then tobidara integrated the spiral zetsu within his body to allow him act as stupid guy and lead the akatsuki from the shadow...so the truth of the masked man tobi is : he is obito and madara and spiral zetsu...BUT UCHIHA MADARA IS THE DOMINANT...TOBIMADARA IS AN EMPTY SHELL OF HIS FORMERSELF S...THAT MEANS HE IS A BODY-LESS OF the MADARA USING A WEAKER VESSEL WICH IS OBITO....EDOMADARA IS THE REALL VESSEL OF TOBIDARA (though its still edofake body) and this must have something to do with madara's body secrets engraved in the uchiha stone..madara is the only flaw of edotensei..becuzhe is dead and alive at the same time..or if you want better explanations " ONE CAN ONLY COUNT ON HIMSELF TO REVIVE HIMSELF"...thats is the mostbadass theknik madara produced in the ninja world...do you have any idea how mastermind evil madara is???....he was behind all evil incidents that happned in the shinobi world...the uzumaki land destruction...the uchiha clan massacre..the manupulation of mizukages...were all his evil deeds