Everyone has their opinion, but in this case a few facts are in order. The Jock Scott which is used as the compulsory fly for our Atlantic/Steelhead Tying Contest 2009 does REQUIRE substitutions for the 'exotic' feathers. Buddy, the fish in this case are Atlantic Salmon. They DO NOT die after spawning....they are documented cases of Atlantic salmon making the spawning trips over a period of five years (maybe more).
The Pacific salmon unfortunately do die after just spawning once, and while they supposedly don't eat, they will strike a fly.