But the messing with the chakra signature shows that there is a possibility that Zetsu can hide/mask a person's chakra signature. I'm not saying you're wrong, but do you remember saying there was no way Madara could survive the release of Edo-Tensai... and low and behold...
Just because there's the possibility doesn't mean it's the most logical one. Defending a possibility with an asspull isn't the best defense either, or else we couldn't say anything about this manga ever.
And to the dimwit: Susanoo>>>>>>Amaterasu and Tsukuyomi. Hell, even the Magatama are better than Amaterasu, since they at least do direct, consistent damage.
And the manga states Hashirama defeated Madara on a death match while it NEVER said Madara was holding back just to pick DNA (which I still find only plausible to a complete idiot who doesn't know spilled blood still has DNA, so why not kill Hashirama and get the village as a bonus?)