Whats Mito got to do with fighting Madara? They sealed the kyubi in Mito after he took control of the Kyubi during the fight. They didn't sealed the fox after the fight. Look at this, some guys are getting confused because managstream made it a bit difficult to tell the difference, but if you look that the translation at onemanga its clear why Mito agreed to seal the fox in her.
http://www.onemanga.com/Naruto/500/05/
The first hokage could not control the fox's mind to order it around like Madara does via the sharingan. He could only suppress it's chakra and therefore he needed it in a person to control it completely( Like Naruto does for Konoha now). That reminds I should put that in the original thread this new info about the first's abilities.
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