Actually kakuzu was clearly damaged by rs, kisame on the otherhand mildly damaged. Anyway my work here is done.The hardly any damage part was along the same lines as kakuzu being in the same shape after taking a rasenshuriken that left a dbz sized crater in the ground. Kishi simply needed him in one peice after taking the attack for some reason or another. The shockwaves from the blast swept people off their feet about a mile away.