I remember thinking the same thing about Deduno, I thought he had some upside.
But looking back on it, it was probably just due to the company he was keeping. That was some wretched starting pitching the Twins put together in that era. Cole DeVries, Scott Diamond, Nick Blackburn, PJ Walters, Liam Hendricks, Vance Worley (sorry Vanimal!), Mike Pelfrey, Pedro Hernandez and the husks for Francisco Liriano and Carl Pavano? Ouch, yeah, comparatively he did look pretty good!