The worst-case scenario for the Yankees has always been injuries. The moves that the team needs to make around any DL move throw things off, certainly more than what we see in Boston. Posada seemed to come back from his “dead arm,” but just a week later it’s clear that the shoulder isn’t going to hold up. What’s not as clear is the path back. Remember that MRI that reportedly showed no structural damage? Now, not so much, because Posada has a torn rotator cuff, the same muscle (the subscapularis) that has Rich Harden on the shelf. Posada will head to Birmingham for an examination and consultation with Jim Andrews. After the announcement, Posada seemed very emotional, which could indicate that he knows this is a longer-term injury or could just be a reaction to being placed on the DL for the first time. A subscapular tear is a bad thing for a catcher, and it isn’t something that one can come back from quickly, though surgery doesn’t look like an option. I’m setting Posada’s DXL at 30, but remember that he could come back as a DH more quickly than that. The problem is that’s not what the Yankees need, and certainly not what they thought they were signing, though they had to understand the risks of signing an older catcher, even one as durable as Posada.