Self explanitory. JKabuto seems to be a somewhat insignificant character as Orochimaru's servant. However, through out the manga, he seems to have flashes of power and abilities that surpass almost everyone in the manga. He has crazy eyes (Always a sign of power) and seems to be hiding a great extent of his power. I personally think he may be the true leader of Akatsuki, or at least a member. I would like more development into him, but it would make sense. He's using Orochimaru for knowledge, and biding his time.
This is all conjecture and no flaming should be done for somethjing as simple as theories.