Tobi is madara reincarnated
This may be criticized,but if u read well it makes sense.i think tobi is madara reincarnated or madara created him to continue his legacy.the 1st assumption goes with the fact dat after fighting hashirama i think madaras body was destroyed beyond repairs[so he thought] so he used d cells of the 1st he got during the battle and created tobi fusing his dna wit dat of the 1st.thats y he[tobi] was amazed wen kabuto showed him edo madara in the coffin.afterwards he changed name to tobi harnessing his powers back to full and mayb cut short his hair or he created himself in different form. D 2nd assumption is dat after his fight wit hashirama his body was badly destroyed,then he used his cells and at of the 1st to create tobi giving him the rinnengan and sharingan.cuz at that tym mayb he had nt mastered rinnengan so bt knew its powers to raise yhe dead,dats y tobi was angry at nagato for not usin the gedo jutsu on him[meanin madar]. Dats y tobi was amazed wen he saw edo madara thinkin how did he put my body back togeda.wen edo madara came out of coffin he said so dat brat still grew up i think he refered to tobi,and d reason tobi cant age is hashiramas dna in him and finally wen naruto askd tobi who he was,he said no one and dat dey can call him tobi or by his former name meanin madara.think zetsu was created to help tobi return to full strenght.i think tobi occasionaly takes zetsu dna wic contains hashirama dna to infuse in him to keep him from ageing.cuz edo madara and tobi all want to do moon eye technique so it means my assumptions 1 myt be correct.