hmm I like the idea of it being the children coming back. I mean the whole Alien atmosphere and green gunk spewing everywhere is a bit green monster, 1950's cliche isn't it? Exaclty how a child of that era (or this to be honest) might envisage an alien visitation.
LOL at Gwen's signiture jumping sideways while shooting move.
Lois does have talents as an organiser etc ("I'm a PA it's what I do") much the same as Ianto was to start with, only now he's more techy and involved, maybe they need someone to be arunner. Or she might have some hidden talents??
Re Ianto, he makes good coffee, apparantly.
BR