The hatchery came before the HCP. I suspct that hunting access to the Cedar River watershed sweetened the pot for the Tribe.

They were also upset that NOAA was into "natural recovery" for Chinook that was destined to give its first fishery something like 50 years out.

Remember that Boldt II seems to say that the Tribes actually get dead fish in the boat. The Muckleshoots, with the Green and Lake WA as their U&A don't have a lot of the desireable (Chinook, coho, steelhead) wild stocks to fish on and it is not likely that the heavily urbanized/diverted watersheds will ever produce much for those species. Ergo, hatcheries are the only reasonably viable solution to meet Treaty obligations and allow King County to stay where and as it is.