With the injury to Nick Johnson its the perfect time to bring up Jesus Montero and get him ready to become the Yankees next everyday catcher. The move make a lot of sense for allowing Jorge Posada to rest as the DH and allows Montero to be groomed slowly for the roll.
Don't get me wrong but Jorge Posada should be the Yankee's DH for the time being until Johnson comes back. He is still a very productive hitter and it allows the Yankees to improve their defense with Francisco Cervelli behind the plate or Montero behind the plate. Posada will not have to catch for a month will save his leg for the playoffs when his bat will be needed more.
Francisco Cervelli has shown that he is capable of being a quality back up in the league. With this incredible start to the season Cervelli value has changed the way the Yankees look at him as well. We already know that he can handle a fragile pitcher in AJ Burnett and help him. Pitcher's have an era of 3.18 with him catching which is the third lowest in MLB.
Jesus Montero is the Yankees best prospect. At the age of 19 Monetro batted .337 an hit 17 HRs in 100 games in the A and AA baseball last year. While not dominating in AAA for now but he is hitting a respectable .250 with a couple of Homeruns. The stats at this point are irrevelant. Its time to see what we can expect from Montero for about twenty games until Johnson returns.
Right now you don't need to play Montero every day. You can play him every other day and learn the pitchers as he goes. Even resting Teixeira and ARod is possible with Posada playing first or catcher and using the DH for either player.