Well we know that Teridax knew what the Bohrok were eventually... not sure if he knew from the get go, or if he did a lot of studying and figured it out. Maybe he learned it from Mutran and his Tren Krom experience? Maybe the ones in Metru Nui were the backup groups, in case they ran into a big enough problem and a whole section of the swarms were taken out? It would appear that those under Metru Nui didn't awaken when the other Bohrok were needed to clean Mata Nui, because they were still asleep during Destiny War when Krakua awoke them, and by that time, the Mata Nui Bohrok had already finished cleaning the Island, and the Metru Nui inhabitants apparently didn't mention that those Bohrok had already been out and about. Well, he made the lock and key not necessarily the cage but I get what you're saying. Though I'm not 100% sure about how the Bahrag would communicate with the Kal. They were designed with the entire purpose of functioning without the Bahrag's guidance, (that's the entire reason the swarms were disabled in the first place, the cage cut off the mental link with their Krana). Now the Ca-Kal had the ability to sense their minds and was directly linked to them, so that they could sense their presence, but I'm not sure if that allowed communication. Also it appeared that the Bahrag went into a sort of hibernation after being locked because the entire purpose of the Xa-Kal was to reawaken the queens which according to the book and comic was done before the symbols were put on the cube. And even if all of that can be explained, how would the Bahrag know what a Toa Nuva was, and that there would be weird symbols that no one had ever seen before somewhere around that could fit into this cube lock that had materialized out of nowhere? I like your theories though! Great insight! EDIT: I looked over at Biosector01 and it does confirm that the Bahrag informed the Kal about the symbols/cube etc. So I guess it just leads to the question of how the Bahrag knew about those I suppose...