Chibaku Tensei cannot be defeated easily, first you have to deduce how it works and even then it needed three s-rank attacks to stop it, one would probably not work. plus, Nagato has an unbelievable chakra pool which he can use to overwhelm his opponents. that coupled with the mystery of his pains, and the linked vision, makes him almost impossible to defeat. he has summons which can overwhelm the opponent, absorbs ninjutsu, summons armour and weapons, can steal your soul with but a touch, controls gravity, and hide in his chameleon which only a great sensor can find while the other pains and his summons run riot. and even if you defeat the pains, the naraka path can revive them. assuming you defeat them all, there's still nagato left.
it took naruto, bee, and edo itachi to stop him while he was being controlled, and even then it was mostly for plot purposes, he had various ways to avoid the totsuka sword, itachi shouldnt have been able to see the king of hell let alone impair it's vision, and he didn't use his god realm at all.