@Haofan123: The worse part is Pein can constantly resurrect his teammates whenever they die so killing them is completely useless, we can't forget Orochimaru.. If he gets a few volunteers from the Akatsuki he could resurrect the second and first. Orochimaru is ridiculously hax, even a halfway sealed could regenerate from a mountain busting beast bomb.
The same can be said for alucard. Hes pretty much immortal. As for oro reviving the kages, he owuld need more DNA from them to do that so he would require prep. And i wouldnt call narutos 4 tailed attack a mountain buster either. Its far from it