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Kuo is a beast when healthy...and the Mariners get players off the field when they're not healthy. So...there aren't any risks to the games on the field IMHO...not ones that matter. If you get lucky and he's fresh and bone-spur free (and in a good state of mind...he suffered from anxiety last year and needed a shrink and pills)...suddenly we have two nasty lefty-killers in our bullpen and a much better shot to match-up well against the big clubs in tight ballgames.
A bullpen of League/Kuo/Wilhelmson/Sherrill/Kelley/Delabar/pick-a-swing-man will blow up the AL if they're all right.