I just thought of something. What if percy still cant be killed. And here is why, right when Nikita, Michael, whoever is prepared to end his life, he is one step ahead yet again. What if he has one final backup black box, himself. What if when he dies, the trigger in his body goes to some unknown location, most likely Division, which has one big black box with all the information of all 7 black boxes on it, and it sends all the information to everywhere, see It maybe inside Division and the black box when done dowloading everything turns out to be a bomb and explodes inside Divsion., so when Percy dies, the entire Division headquarters explodes with everyone in it, thus they cant trace to where all that info came from.