Yeahhh, dont you think saying an 8 gates user can be defeated by sasuke is kinda general i mean i only know lee and guy, sure he can manage to kill the before they let it out but honestly, from a scientific standpoint, (not manga facts, because i feel some people have gone full retarted and need actualy science to bring their back to reality) his spees was litteraly warpingthe light around him, im no space physisist but last time i checked chabaku tensei is not a complete black hole light still escapes it, so once those eight gates are open sasuke has no choice but to run, if he can by the way. I mean madara didnt die. Becausr of his regeneration but sasuke has no sutch thing only instant transmission once.