I'm just saying that when I read about this PredAlien regurgitation method, it made me think of "The Hidden" and how the creatures are passed from one host to another. I'm not saying the chestbursters will EXACTLY be passed like that, but probably very similiar and to me, that COULD work.
If we use my theory of what a young Queen does, when there are no Alien drones around to help, this regurgitation method makes sense, IMO.
Or maybe the PredAlien has its own method (seperate reproduction cycle from the Aliens, after it's born normally from a Predator host). Maybe it takes on it's own type of reproduction cycle, which is different than the Aliens. Sure, that would complicate things, but I'm trying to make this logical.