While I wasn't one that wanted Giminez DFA'd, Garver could have DH'd, spelled Mauer at 1B, played some LF in a pinch. He didn't need to come up exclusively as a catcher. There was room for both of them. You are correct though that this is why Giminez wasn't DFA'd. If they would have called him up a month ago, he'd likely have at least one game behind the plate. At least he would have gotten his feet wet already.