Oops. Well when I say DBZ levels I mean early DBZ, because I'm pretty sure Yusuke and the demons he beat could destroy huge sections of land and they were even using that little blur movement thing that DBZ uses at the end. Hiei was already insanely fast in his appearance and Yusuke still beat him when Hiei was way faster than him at that time. Now Yusuke is incomparably faster than Hiei was then.