With Matt Harvey out for the year, Jeremy Hefner (remember him?) also out until at least August / September, and the chronically injured Jenrry Mejia hardly a lock to hold down a rotation spot, the Mets would seem to be in the market for a few pitchers — starting pitchers in particular. Picking up a reliever or two is also in the cards, considering that Bobby Parnell may not be ready come Opening Day, and the bullpen in general is less than impressive. Already, though, several arms have been signed by other clubs. Let’s look at who’s off the table, including the most recent righthander plucked from the free agent market.