from the Seattle Times: The Mariners will send Kirby to the mound in Game 3 of the American League Championship Series when it returns Wednesday evening to Seattle. That leaves Castillo as the starter for Game 4 on Thursday with the hope that Bryan Woo will be able to make his return for a potential Game 5, if necessary.
Best to do is pitch him game 4 if we win game 3 and then Castillo game 5. Let him "ease" (as much as you can do in a CS) back in. They are doing right by Woo, IMO.