Via Chad Jennings:
“He’s the No. 1 catcher in Triple-A. And we had a real need where, when McCan isn’t playing, he’s going to play. … Now that we’re in a situation where when the No. 1 catcher isn’t there, the backup is obviously the starter, we’re going to take the best player.”
Pretty cut and dry, and logically 100% right. Murphy is the guy in Triple-A now, not Romine, and so he should get called up when the Major League club needs a backup catcher. As much as playing every day in Triple-A might help him sharpen his skills, it's not like Murphy is not going to be playing at all as McCann's backup and it's not like he's not going to learn a ton and have the same opportunity to improve his skills working with and against better players and more experienced coaches. Bring him up, let him get regular backup reps, and start to get an idea of what kind of Major League ceiling he has. Makes perfect sense to me.