I still consider all six, or rather seven since the original isn't among them, to be just one dude. These six ninja now, while kicking so much ass that Konoha, supposed to be one of the strongest ninja villages, will soon be nothing but ruins, are still 100% expendable. So, losing one or all six of these will mean nothing at all to Pain yet each one of them is able to cause massive damage.

I'd say that's quite a bit of power. Any normal six ninja of equal prowess would still face the danger of getting killed but that's of no consequence at all for Pain.