Everybody here is so caught up in the revelations of recent episodes that they've missed.
BSG is no longer letting "mystiscism" be an anwser. Thats what shocked everyone with the reveal about the history of the final 5 really. We where all expecting a few mystic anwser that we had to take on religous fasith, instead it was for the first time in BSG's history pure hard science anwsers. And that throws the question your all not asking:
How do two diffrent models of hybrids, neithier of which is supposed to have had any contact, know at least smthing about kara. The old Mystic explanation dosen't fly anymore. they know and theirs a sane logical scientific anwser to it all.
Short vershion, whoever or whatever was/is responsible for Kara and her destiny has some kind of contact or connection with the hybrids.
Other things that i think need mentioning:
1. The hybrids are supposed to be incable of disobeying commands "they don't get a vote", yet in the Hub one does just that. So much else was going on we never realy asked too strongly about it. But in linght of cavil's littile mutiny all those years ago we now have a new light to look at it in. Simply put the skinjobs never had anything to do with the hybrids in the first place. I suspect their just finial 5 enchanced vershions of what the centurions had allready developed, or possibbly the work of this number 7.
2. In light of recent revelations cavils insistance that their is nothing to understand in the hybrid's mutterings become highly suspicious. Given how littile they know about them, even the 5, it's quite possibble he was never able to erase their memories meaning the hybrids know exactly what cavil did. Certianly his insistance is suspicous, but he dosen't appear to suspect they are capable of independent thought, (anymore than he suspected the same of the raiders prior to their actions). It raises a lot of question about who they might be working with and/or what they might be doing atm.
3. I think most people are right in that the whatchtower music was probably somthing the 7 wrote, but beyond that anything else (assuming point 2 holds true) is irrelevant since the hybrids could easily have acess to it. Likewise if they are working with somone or their is somone else out their that is unconnected to them thats upto stuff, if they have full memories pre-dating the cavil rebbelion then they would have acess to it. it dosen't have to be the 7 himself for it to turn up in any given place.
4. given that the 5 where able to recreate res tech and apply it to themselves despite quite a few generations having passed, (meaning that their should be significant if minor diffrances betwen the originol rezzing type and non rezzing type), simply put it's probably possibble with a few modifications to rez just about anyone with it, meaning kara dosen't have to be anything other than a plain good old fashioned human to have been rezzed, she just needs adding to the system. Te big question is more where was she rezzed, who by, why, and why dosen'ty she remember anything. the thought is beginning to cross my mind that maybe kara wiped her own memory and sent herself back, in effect putting the ship on autopilot right before wiping her own memory. in fact given that she dosen't remember blacking out at all and it's a clear clean timetrack between "blowing up" and lee finding her it more or less had to have been done right there in her viper just before lee found her. So it makes kara the obvious choice for who, though it raises even more intresting questions about whats going on with her if she'd willingly go along with it once she had all the details.
i did have a few moe thoughts but i'm a bit too tiered to go through them right now, i think i've given you eough to chew on for a while though.