I think you have to bunt, no matter who is up. First of all, with Griffey's bad leg, he's not as fast to break up the DP. Secondly, CASEY has been a much better clutch hitter all year for them and being a contact hitter, I'd take my chances of getting the runner in from third with CASEY. Of course, as mentioned by Fletcher, they would probably intentionally walk the bases loaded, but then you have to worry about PB, WP, HBP, or in the case of TOR/SEA, a walk to win.
I hate the way manager's HAVE to manage around these fricking egos... no way to handicap that crap. SEATTLE is one team that will do whatever it takes, doesn't matter who the batter is. That's why they are where they are. Sure there are EGOS in MARINER land, but most got shipped out long ago, and the ones that remain think TEAM first.
Baseball is still baseball... you move the guy over and try for the FLY BALL. Knowing you can hit the ball and have it caught and still win, takes a lot of pressure off the batter.