not every non-clipped coho is counted as a native...it depends on the river system.. most aren't....for instance in the klickitat you can keep all those unclipped coho AND unclipped chinook(yes..there are unclipped 'nooks released into the klickitat for treaty reasons too though they're all cwt'd) the green r.,nisqually,satsop.etc.. also allow you to keep unclipped coho...
as far as angling on ESA fish...if the poulation gets large and healthy enough, for whatever reasons, to sustain the escapement and sport harvest..enough to de-list it... why not fish on 'em?