I’ll make this brief, but the A’s dealt third baseman Jack Hannahan to Seattle today for minor league right-hander Justin Souza. Souza, 23, was 6-6 with a 3.35 ERA in 20 games (14 starts) with Double-A West Tennessee. Bob Geren pointed out Souza’s good K/BB ratio (62 strikeouts, 18 walks in 78 innings) and said he’s likely to report to Double-A Midland for the A’s. I don’t have much more on him at the moment … Hannahan, acquired by the A’s in August 2007 from Detroit, provided a tremendous glove at third while filling in for Eric Chavez. But he didn’t develop into the impact hitter that teams look for at the corner infield spots. He’ll be reunited in Seattle with Mariners manager Don Wakamatsu, who was on Geren’s staff last season.