Damn, that does seem pretty conclusive. I was thinking, a couple things: Brother Vance was sent to rope us in, the Trials weren't the immediate reason for trying to entice Guardians, there was something else and the Trials were just a fallback; If Osiris was exiled from the Tower, and as the Speaker's apprentice as well as the Vanguard Commander (the position currently held by Zavala), why is the Lighthouse bearing the Speaker's banner? Why not the Osiris themed banners? What if the true intentions of the Cult of Osiris was for a select few Guardians to investigate the Lighthouse, to show us something about the Speaker?