I liked the manga last week, fair enough Naruto was using moves that was overly powerful like Sage Art: Super Great Ball Spiralling Large Group Spheres or whatever its called. His fighting the Fox in his mind while sitting down, hes got all the sage chakra he want's, also people saying that he should use Frogs, he can't since his in his own mind.
I belive that Kushina speical chakra was to control the tailed beasts and the Konoha ninja put the fox inside of her for save keeping and just after Naruto was born Madara kidnaped Kushina while she was weak, and extracted the fox right away, then attacked Konoha days after.
Im still not sure why he did it, mabye he dident want Konoha to interfer with his "eye of the moon plan" but his plan failed because Minato sealed the fox inside Naruto therefore weaking Madara's power of destorying the village hes only choise was the retreat, since then Naruto been underguard and Mardara was focusing on getting the other tailed beasts intil now.
Kushina also might be on the family tree of the sage of the six paths, considering Naruto could be the reincarnation of him.