It turns out Sam Deduno netted a loss of 30 strikes per 1000 pitches. It wasn't the greatest number among starter but did rank third behind Justin Masterson and Jeanmar Gomez. Bad luck? Poor pitch framing on the part of the catcher? Umpires knowing his reputation not expecting a strike?
Below is a link to a graphic from Texas Leaguers showing Sam Deduno pitches.
Among starting pitchers, Freddy Garcia benefitted the most from getting strikes called on balls outside the zone. Among all pitchers, Jeff Gray had the worst "luck" losing a net of 39 strikes per 1000 pitches.
This data may not mean anything. It might be the catcher. It might be the pitcher. Maybe it is a combination of both. Doumit has not fared well over the last few years in attempts to measure pitch framing. Did he catch many of Deduno's games? Maybe it is a combination the Twins want to avoid.