I believe GC is actually SOFDTI. For one, both seem to not fully understand humans, the way they act, their emotions, and their love of battle activities. Plus, their voice actor's last names, mongillo and gillmoon. Re arrange either one to be the other, and it works perfectly. I believe that ryan gillmoon is a stage name for casey mongillo, and gamecrazed is a self created account made by SOFDTI so she can do good without the webmasters looking over her shoulder. Plus, bothe SOFDTI and Casey are felmale.
I'm sorry, but this theory is incorrect. As now seen in episode 00, the forbidden power is the banished side of SOFDTI, the accidentally created life form of the webmasters. It holds all of her anger, hate, and greed inspired by us humans. True, Zetto lost his arm from the power, but that is because he attacked it, thinking it was still the original shadow guard beast, along with him being the webmaster that tests battles. Plus, it would be unethical for the webmasters to make something to hurt others. No one would play the game when they found out about this feature! So yes, the webmasters did creat the forbidden power, but not intentionally for it to be part of the game.