Mitch Garver is starting a rehab assignment, but it sounds like he won’t be catching anytime soon Texas Rangers catcher Mitch Garver is starting a rehab assignment with AA Frisco today. Frisco is at home this week, which makes it convenient for Garver to join the Roughriders, especially since the Rangers are at home, at least through Wednesday. Texas starts a four game series in Houston on Thursday, and coincidentally (or not coincidentally) Round Rock is playing in Sugar Land this week. For those who aren’t up on their Texas geography, Sugar Land is a suburb of Houston, and its…