Brinx

I think it could be Orde for these reasons:1. Orde was created over 100,000 years ago by the Great Beings.2. Orde is male.3. All Toa of psisonics minds are shielded the Great being wouldn't want anyone getting into his head.4. Orde could be trying to throw the others off about him being the Great Being.and could be just using them.5. As a Toa of psisonics Orde could have planted knowledge of himself into Tahu's mind when he was selecting a team for the mission.