I know. It's all wargames. Everyone is a cylon. There are no such things as coloials, or if there are that's what the wargames are for, to deteremine likely tactics. It's like red team vs blue team only red team has had artifical memories placed in them to help them "play" their side better.
Perhaps the Human programmers have been following and watching in their cloaked lab ships
Edit: I wondered for a second about my hypothesis since a few of them have been back to Caprica but we know in the Base ships the Cylons see their own reality, that's why the inside is so bland. Those who went back to Caprica were just seeing an artificial reality.