The idea that Casey Fien was on a short leash percolated through twitter and the blogosphere in recent days, and while the bullpen as a whole has been pretty rough, Fien seemed like a marginal guy. He doesn’t have the youth or fastball of a Dan Altavilla or even James Pazos, he doesn’t have the platoon splits of a Marc Rzepczynski, and he doesn’t have a good season with the club the way Nick Vincent does. With Tony Zych’s return imminent, the M’s were already thinking about which of their bullpen arms to move, and Fien’s so-so outing yesterday just moved the timeline up.