The treaties that grant current tribal fishing rights have nothing to do with science or who was "here first." They are binding political documents, negotiated and signed by particular parties. It's as simple as that. The controversies surrounding Kennewick Man, however thay are ultimately resolved, will have absolutely no bearing on fishing rights or any other aspect of treaty interpretation. Whether or not caucasians or the ancestors of Indians where here 10,000 years ago doesn't change the fact that modern Native Americans certainly were here 500 years ago when Europeans first arrived, and 150 years ago when Americans began settling the NW, occupying and utilizing the land that white settlers, speculators, and governments thought they'd like for themselves. Those are the people the US signed treaties with, not some speculative white-man's ancestor in North America.