Okay, so we got about 50/50 love for Kabuto. Something to take into serious consideration is that like somebody earlier mentioned...Kabuto's red eyes. could he possibly have an inherited family blood limit (again..brain fart). Something else, I believe in the episode where Tsunades apprentice/attendant managed to get the blade to Kabuto's throat, the angle didn't clearly show where his weapon was. It could have been in a prime spot to split her in to with nothing more than a flick of the wrist. Then again most of this is speculation and hypothetical blabbering...Or maybe even a desperate attempt to keep the thread alive, heh.