With Shea Langeliers set to go on paternity leave , a hole on the roster has become more evident. While the A's backstop is only expected to be gone for a couple of games, his backup, Austin Wynns, has been struggling mightily in his limited time at the plate this season. His defense has also been largely league average. Wynns typically starts a day game after a night game to give Langeliers a rest from catching while Shea stays in the lineup at DH. In those games, Wynns has gone 3-for-35 (.086) with a .158 OBP, which comes out to a -33 wRC+ (100 is league average). Now he's the one in command of the A's pitching staff, which is completely fine in a small stint while Langeliers is away. But it also exposes the A's lack of catching depth, and their reliance on their backstop. Yesterday we took a look at some of the A's minor league options behind the plate and there just isn't a lot to be overly excited about both in the near-term, or further down the line.…