The preseason matters. Okay, maybe it doesn't matter who leads the preseason in passing yards, or whether the third-string QB on the Packers plays well. But it matters for illuminating who has which spot on the depth chart, and who is winning which position battles. It matters a great deal for Fantasy players, in other words. As we head toward Draft Day, you need to know all about those aspects of the game, and we're here to help. Our experts broke down everything you need to know from the first round of preseason action.