regulating his haki so it doesn't use up too much on one attack doesnt mean its a nerf .
enma is a pu because it is teaching/forcing zoro to do something the other swords didnt .
1.he never had to focus this much on how much haki he put in the swords on every attack.
2. depending on the explanation we get this chap, it might be the reason zoro chooses to coat his blades with coc instead.
its not a nerf
he doesnt use all of his haki on his other swords either. he would be drained if he did.
enma is a pu because it is teaching/forcing zoro to do something the other swords didnt .
1.he never had to focus this much on how much haki he put in the swords on every attack.
2. depending on the explanation we get this chap, it might be the reason zoro chooses to coat his blades with coc instead.
its not a nerf
he doesnt use all of his haki on his other swords either. he would be drained if he did.
Look is even causing pain to Zoro. Nah this is a nerf especially if the guy that is using the blade hasnt understand yet what the blade want from the user (which after this spoiler we are getting the answer).
Based on that I can argue that Enma was fighint all the time against Zoro which coudnt use his own power as he wanted and also use the fully potential of Enma.
I can agree that Enma is at the same time training indirectly Zoro control of his Ryou at the cost of losing focus and getting exhausted.