The face bone doesnt really exist, it's more of a group of bones that is created at compiling stage (could be way the GLA handles the face hierarchy?), that is based on what i see in max and the compiling log.
This is what the compiling log shows:
Bone 15: "cranium":
Parent: "cervical" (index 14)
Child 0: (index 52), name "face"
the #kids:1 of the cranium is the "face" group, yet it doesnt exist in the skeleton.
So ignore the face bone...even the bones extracted from the JA .GLA didnt have a face bone, still shows up everytime a root is compiled. Carcass will do its magic.