I think the same thing Rhambuk/baalzy expressed. If your group is there first you are free to claim all or as much as you want, irrespective of the precise spot your casters are medding.
If you have insufficient force for a full clear then the new group should be granted your leftovers. Your call what you grant them but to be fair if that is more than one spawn they should be adjacent to avoid pulling issues. i.e. not the 2 spawns from diagonally opposite rooms.
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