My theory is that not_Scyess is Scyess' friend (roommate, lover, coworker, whatever).
I don't remember any kind of confrontation between them, which suggests that Scyess was okay with not_Scyess and probably knew the account was getting created. And they have sort of similar senses of humor, but there are more differences than similarities: in following lists, in stripping style, in the times they show up at the site....
As for the MaKKs, don't know and don't care, but I always assumed they were the same person.
The what mentioned above is total fiction. Please don't take it seriously!