Seattle doesn't need an outfielder, so the chances are probably pretty damn close to 0, maybe even negative. Not sure how Kirby comes out to lesser value than Miller or Woo, either.
If the Mariners are moving a pitcher, it's probably 1) trying to convince Luis Castillo to waive his NTC 1 year before he doesn't have it any more, 2A) Woo, 2B) Miller.