Oro was in need of a new body honestly he was holding his own wit 4tails in sicken state they said prime oro winsHow could orochimaru possibly win I mean come on people make sense.
How can oro counter tbb or bee's kenjutsu.Oro basically lost to a four tail naruto,Bee would win mid diff
Edo tensi regeneration shedding of skin 10,000 snake jutsu manda hydra witch regenerates and releases poisen gas
Not to mention his duriabilty he was able to take hits in sicken state from 4 tails punchs from tsunade (who broke madara Susanno and is physically stronger then A who's overall stronger then bee not saying it goes A>b>c just stating his duribilty is the best in the series)