I asked WDFW about this at a public meeting last year: The bio's answer was that 203 is excluded from early archery so that the High Buck Hunt is the first season of the year up there. With almost all the other GMUS having archery first, Pasayten is managed so that rifle hunters get first opportunity somewhere. I don't know if there are any other GMUs that are managed the same way, but if you are planning to archery hunt any of the High Buck Hunt GMUs it would be worth double checking.