But the last Cylon is obviously different -- the one difference we have seen is they didn't gather in the Cylon meeting room on Galactica. However, that's not likely to be the only difference. It could be many things

* They are not on Galactica, but did trigger at the same time, alone on their own ship
* They are not meant to trigger at this point, but later
* They are not a sleeper at all, so they have no reason to trigger
* They are not with the fleet any more (ie. dead character like Cain)

I view the final Cylon as possibly having the number one, special in many ways.