If against the emaciated second stage Juubi, Kirin would certainly do more than nothing. I don't know where people get the idea that the juubi would be unaffected. If a simplte Kusho can push back its tails, and a FRS can outright cut them of, the a Kirin taking advantage of all that lighting would do more than tickle, though I don't see it damaging anything but the Juubi's tails.