I feel like some other people on here are acting like Mauer calls the shots, which seems like a very unreasonable assumption. As you said, Molitor makes the lineup card. If Molitor says Mauer is playing, then Mauer is playing. If Mauer says "No, I'm healthy but I'm taking the day off," and Molitor allows this, then thats yet another reason to fire Molitor. If Molitor said, "Joe, you're taking the day off," and Joe said he'd like to play, it's still Molitor's call at the end of the day. Blame for any lineup issue should be placed directly on Molitor (or the FO for the players they provided him with). In this case, this one is entirely on Molitor unless we hear otherwise. If someone comes out and tells us, "Mauer makes the decisions over Molitor," then Molitor should be fired today for not understanding that the manager is in charge. But, we have no reason to believe this to be the case and its foolish to act like it is.