No, it is not, the hybrid form is just that, it is the junction of the two, and not simply transforming a part of the body and maintaining the human rest. And no, March is not fighting 100% against King and Queen, he is destroying both without much effort, it is very evident.
So what if he said that? If he had been superior he would have at least pushed March backwards, which he failed to do. Marco said a similar thing because of Kizaru's shots. Phrases don't matter, what matters is feats.