Actually, the 50:50 is to Indians, not specific tribes. In theory, Makah could take 100% of (say) the Indian Chinook in their troll fishery and no inside would be able to fish for Chinook. Except that WDFW would cut back the sporties to allow them to fish.
I have seen one tribe cork another that is further upstream. So, there really is nothing to keep the QIN from taking the full Indian share in GH and leave the Skoks with zip.