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Just making sure I understand this.
If a new Invader type is spawned in the middle of the Activation Phase you do NOT add an Invader initiative card, correct?
Of course those new group could use one that is flipped up later in the same round...
You do actually!
The only way an Invader can spawn additional groups during the activation phase is with the Infestation Threat Card being in play for that mission. Whenever a Marine opens a door and a new monster group spawns, an additional card is added to the initiative deck for the Invader for each new group coming onto the board (at the end of that Marine's turn).
This text is written right on the card if you need further clarification.
Hope that helps!