well you know how everybody is wondering who the great being in disguise is, Well i have my theories
- Darkness the Dark Hunter reason He is always watching the Shadowed One and Thus see everything the shadowed one does . thsi way he could observe the matoran universe without getting directly involved.
- Dark hunter Recorder. heck he records everything the shadowed one does.
- And my final possibility is Jerbraz.I mean heck he is invisible and thus he could have been on mata-nui island the whole time without anyone knowing. perfect form for observer.
But yeah those are my ideas. let me know what you think