I might say that the presence of a Seer is a threat for the werecreatures, but nothing more if the Seer is not actually "gifted" in her/his role or just pure lucky.
But the ranger I see more of a threat to the wolves and a balancing factor in the games. With a ranger around the wolves need to be careful with their picks and that really slows them down...
So if we are to limit the gifteds, why don't we just have a ranger (or two) without a seer? That might be different and fun and interesting!
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Upon the hearth the fire is red
Beneath the roof there is a bed;
But not yet weary are our feet...
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