The most impressive part about Zoro using Enma for the first time was the fact that he didn't pass out like others would. He said himself that he ISN'T used to the sword yet.
The process should look like this:
Using the sword (without passing out) >>> Getting used to the sword >>> Mastering the sword.
Zoro only showed the first stage during chapter 955, and he's probably fairly used to it by now, but we can't be sure until we see him using Enma is a fight
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Pre-Wano Zoro?