Okay I won't call the 20k army fodder, I do believe Ridoku simply sealed the Jyuubi and used its chakra for most of his feats. I don't think that any of the army will have that much of a pivotal effect against Madara. I believe Madara up until this last chapter has been EXPONENTIALLLY BORED. The Dude has been playing with his numerous jutsu's like a deck of cards in Yu Ghi Oh, at will. Madara could have at least merc'd everybody on the battlefield at least 3 to 4 times, and thats without even using Jyuubs IMHO.
Nobody has threatened Madara seriously in his mind since he woke up from Edo, they're simply in the way of his plan. And like Obito stated he's like a kid, hell I understand, the Dude hasn't fought anybody since Harashirma all the way back in the day, I'd want to floss too.
Show Me How Much You Have Evolved...(As Tian walks toward an Army he's been waiting eons for).
I speak 4 languages...
English, Profanity, Sarcasm, and Real Shit.