It says in The Initiative that only Sasquatch survived. Battle Damage says that when Alpha Flight confronted the Collective "few survived." Few is more than one. Sasquatch is also described as "one of the few survivors." The same entry says that "the majority" of Alpha Flight is now gone. I am sure I read somewhere else recently that "several key members" of Alpha Flight perished but I cannot remember where. Whatever the case might be, it doesn't seem entirely certain that Sasquatch is the only survivor yet.