Someone argued why madara didn't took kin/gin since the begining if that's all it takes for the jyubi. Well, if you read on *********** (the best translation), shikamaru explains it very well. Madara wanted to use them as much as possible and then waited the right moment to seal them.
You must be registered for see links
And look at the comment of the glass guy (fergot his name), and the remarks of madara "loss here is not an option"
You must be registered for see links
I think that Madara is afraid of naruto and bee and the moment that these 2 went out for hunting, madara decided to power up his self to counter those 2. Itachi and him self said that madara is weaker that he once was, so he has to revive the jyubi even though it must be weaker since it will not have all the power of hachibi and kyubi, but enough (he think so) to counter naruto and bee.
Feel free to comment