Originally posted by: HyuugaNinKabuto has to be the most powerful genin around. His skill level has been said to equal or exceed Kakashi's and he was able to handle the fifth Hokage by himself. He is also a medical ninja which would be invaluable on dangerous missions.
Kabuto was a leaf genin (he had to stay there for the sake of the rank), but he's not a leaf anymore... and he seems to be in higher standing with Orochimaru than the sound 5, which I presume are chuunin, so that would make him a likely candidate for a sound jounin nowadays... (that is, if the sound are a village anymore; presumed heavy losses in the attack on Konoha and then the probable loss of the sound 4/5 should really cripple it, as a village, for a good time to come - and we've yet to see Orochimaru mentioned as the kage of the sound, to begin with...)