[DISCONTINUED] EssentialCmds [v8.1.14]

Just set this up, had not one problem, very good.
I was wondering, I am looking to use another plugins permission than PEX, but for some reason, even though I don’t have it installed, the ./nick command works like a charm. Is there a way to fix this? I would need this disabled if I want to go with this mod for permissions, which needs a NameAPI mod that uses the same command for setting a nick name.

Would it corrupt each other if I were to run them both knowing that the ./nick in essentials is working fine?

I am using EssentialsCmds-7.4e and SpongeForge 1.8.9-1732-3.1.0-BETA-1158.

Thanks for the help!