See my
FAQ
WG that are joined to other packs count as part of that pack. In order to get the
KP for that pack, you have to kill them all,
WG Pack Leader included.
To get the
KP for the
WG pack, you have to kill the remaining members of the pack that are still part of a
WG pack.
So, for example, I have 4 Wolf Guard, put 3 as pack leaders and 1 on it's own. If you kill the lone
WG, you get a
KP, but if you kill the squad one of the pack leaders is with, but not the pack leader, you don't get a
KP.
In your example, you cannot give up any
KP for the
WG unit, as the enemy can never actually kill the
WG unit.