Currently Sanji is the most probable opponent for King, they are the only underlings able to fly.
Perhaps Zoro might help him, but Sanji has already dealt with a CoA Master swordman, Raisin, with blades, Daifuku and Judge, cutting damage, a meteor slicing named attack from Doflamingo without the RS, and can easily dogde Zoro slashes without the RS.
He doesn't need any help
