The wendigo might or might not come with a personalized spirit. If the spirit is not personal, then it’s up to the player to play the subliminal urges and monstrosity of the character as he wishes.
The wendigo is powerful. If it could be controlled and corralled, perhaps it could even be a match for a pack of Vulfen: a weapon born of desperation.
Meetings between communities are a low-key event for heroic drama, but important for the Inuk, for whom new faces mean new marriage and trade opportunities. Consider enjoying this material at the pace it sets.
Spirit interactions can be interesting, as the smart community goes a long way in satisfying the spirit, whatever it wants. But there is a line at which the spirit becomes a liability; the good shaman knows where it lies.
I am personally convinced that the southern glaciers do not hold just doors into dreaming, but to other worlds. Perhaps the two are one and the same.