This twitter message from the Mariners' beat writer says the Astros signed relief pitcher Roy Corcoran, whom was released by the Mariners after refusing a minor league assignment.  This seems OK if it is a minor league deal, but the fact that Corcoran left the Mariners because he wanted to stay in the majors makes me wonder if he will soon be on the Astros roster.  Corcoran is a heavy groundball pitcher who walks too many batters, doesn't strike out many batters, and has...