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To 'really know' is kind of a different question :- )
I think we were talking about whether it's a good idea to give Wilhemsen a shot at starting -- say, in Arizona in March. We've had a glimpse. We can get a longer look in ST. We can give him a normal trial (like Erasmo, Taijuan, etc) any time.
There are no guarantees in baseball, up to and including Hisashi Iwakuma ... guys get hurt, guys pitch lousy, etc etc ...