Here's my original question.
What power did enma give Zoro?
If you clever , it is very obvious. It is said that enma is sword to enhance your haki usage capability.
for example , zoro have capability of 100 unit haki .
normal zoro is able to use 40 unit in his current form.
however , enma wants to extract all . This is too much for zoros level currently. Because , haki consumable thing for users.
what zoro did ? He can control how much haki release by wielding enma with coc . He can release as much as he can hold anymore . To defeat king , may be he used 60 unit . It was enough. But , this haki usage knocked out zoro again . If zoro is already cabaple of using all haki capacity, enma would be useless.
In other words, check g5 . G5 enable to use unlimitless coc source for Luffy . Does he can use without g5 ? Nope . This is same for Enma .
How cannot the normal reader understand this ? It is very simple .