I feel like that's what Luffy has been doing but it might be like an mp bar in games where even if you keep rising it you can burn through it almost as fast if you're using bigger moves than before, like Zoro doesn't huff and puff blocking the wind blade but looks a bit drained after going for a dragon slaying finisher.
That actually makes a lot of sense with Zoro. Him using a sort of finisher is what exhausted him.
I am not liking Enma at all. I hope he gets Shusui back after he kills Kaido with Enma. This sword has been getting too much hype for doing fuck all but suck on Zoro's haki.
I do believe he would have replicated this feat with Shusui or Wado but Oda and his damn parallels.