I'm a bit puzzled as to how this works. In some missions the 'stealer player begins with say 2 blips.
What does s/he do with them? Are they placed, lurking until the first stealer turn, so that you bring on 4 blips in your turn?
Or do you move them on / convert them and bring them on exactly as you would if it was your turn but before the marine player's first turn?
We've been playing it the second way, but I'm not sure about it.