Petey mindripped that one gatekeeper without removing his brain.
ryos, starting at which strip should I read it so I get the whole thing? Since as far as I can tell I've read it and don't see anything other than what I've been saying here. Infecting them with the nannies in order to wipe their memories seems like using an atomic bomb to swat a fly. You use a tool for its primary purpose; if all they wanted was to wipe their memories they would have used a much easier and specifically targeted method.
I think they all still have the nannies for some reason of Emm's which she will reveal in some future job (and maybe wipe their minds again later). She wants them all to be super laz'r'us soldiers without knowing it. That's why they were injected with laz'r'us nannies and then got their memories altered. Occam's razor.
You make a good point in #2. Maybe Schlock is infected still but stuck some of himself in the eye beforehand and kept the eye from getting infected just so he could pass on that memory.
[EDIT:]
Okay, I've read through them again, and you could be right. If so, though, I still don't understand why they used the nannies to alter their memories instead of a more targeted method. But the sequence of events seems to have been 1. Decide to kill them all, 2. Decide to rewrite their memories, 3. Decide to give them all the nannies, 4. Decide to hire them. If it was the way I have been thinking it was, then the order would have more likely been 4, 3, 2. But even in the order it was, they could have decided in the middle to have them keep the nannies secretly and hire them for a future job where they would come in handy. If not, I am not sure why Emm keeps hiring them.
In the panel where Petey says which species he has adapted the nannies to, he does not mention amorphs. This would suggest that he didn't adapt them to amorphs, and Schlock's memories were rewritten using some other method (I don't know what would have worked that did not involve some kind of nannies though).
I don't think it's unambiguous.