Defensive metrics are hard to trust without multiple years of data. I am sorry that after writing about Bobby Witt last week, and then Matthew following with his own piece, that I still feel the need to write one more article in this vein. If you would like to skip my writing, this is really all you need to know. Defensive metrics in one season just do not tell you enough to draw lasting conclusions, two or three years is a lot better to know what a player is. I am going to write this, then post a poll to…