Enma enhanced Zoro. Go back and read again. RS is Sanji's training tool
RS Sanji> > > > Enma Zorro
There is no such thing as enma enhanced Zoro. Enma doesn't give Zoro anything. It just forces him to release more haki if he can't fully control it.
As we saw at the beginning of his battle with King the danger to using it is gone. It no longer forces you to lease more haki than he wishes.
King couldn't even ragdoll Zoro when Zoro was not using haki. He could only overpowered Zoro, who was using a mid level attack, while King was using part of his hybrid mode to increase his strength and a high-end Divine attack. Even with that, the attack wasn't even enough to make Zoro bleed. He bled from going through a ancient giant skull.
King was once again trying to defeat Zoro by finding a way to get around Zoro combat strength. First he tried to beat him by taking a swords. Second, he tried to beat him by knocking him off the island and having her fall to death. He failed both times.
Sanji on the other hand required Queen to "accidentally" attack himelf twice just to free himself and stop Queen from killing him. He still needed an in battle power up. Sanji was getting ragdoll.