check the manga dude.... when minato talks about sealing kyuubi... he clearly states that i ll seal kyuubi's half power permanently...
So how will the juubi be made if one of its parts of missing. Will a clock work properly if i destroy half of one of the gears? Will a car properly if i take apart half of the engine. Will an airplane fly properly if it loses a turbine? Will a ship stay afloat of i remove 50% of he hull?
NO!
For the juubi to be recreated it will need all of its chakra not 90 or 91 or 99 but 100%
Since madara knew that Minato sealed the yin or yang chakra of the fox but he still plans on recreating the juubi then he even knows that the fox chakra has regenerated.
Also if 1/2 of the chakra typed needed for TBB was sealed why is kyuubi able to use it?
If Half of the chakra was gone PERMANENTLY then why was the Kyuubi bigger when he was bursting out of chibaku then at the time when he was sealed.
If it looks like duck, walks like a duck, sounds and smells like a duck then its a duck. Not a chicken...