Get your knickers unbunched, PG.
I read that as 'they wouldn't use only a showcase performance to recruit'....hence the "one time performance" mention. That does not suggest that they don't use showcases to identify guys for more attention.
With the FL & AZ October Wood Bat tournaments, however, I would be willing to bet the majority of quality players have played in a PG event, wherever they might be playing now.
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From 'Nice Guys Finish Last' by Leo Durocher:
Baseball lives at the center of a never-flagging whirl of irreconcilable opinions.