Because the Kyuubi Shroud is formed from his blood...
Well shouldn't that be more then enough against someone like Ikkaku?
I meant, consistantly being picked up and throw around isn't to could for someone...
Mini-Kyuubi's Chakra Shroud used his body as a skeleton, but my recollection could be wrong. All I know is that he can still control himself at the KN2 stage.