When you cast Cultural Contamination G'hern Isangoma doesn't get affected by the spell, means that she doesn't gain Pack Leader while all the other G'hern gets the ability. Tested at least 4 times against the AI.
bump and update: Cultural Contamination doesn't work on any G'hern with overseer Moga 1. Tried with all of them, the ability leterally doesn't pop up on them. Is there a reason for this? @Moles