Claire has not always been the skinwaker. In S03E06 Real Estate Tommy a.k.a the BGK is standing next to Claire and they are both trapped in the haunted house, so unless you think the the BGK has a twin, I don't see that's possible.
He/She only becomes the BGK after "Tommy" died. The question is when. The BGK needed to be on the inside, so right after "Tommy" jumped overboard from the boat....game on
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