Which do you feel is better? Maximize a player's potential or use a player's potential to maximize the team's potential? Personally, I prefer the latter. I would use Lewis at whatever position that places the best Twins team on the field. If Larnach proves to be a better right fielder than left fielder, then put Lewis in LF and Larnach in RF. If Miranda becomes the next Brooks Robinson (for you young folk, that means superior defense), Lewis never plays 3B and will be forever an outfielder. If that ends up becoming a problem of where to play Lee, Lewis, and Salas, the Twins will have valuable assets to trade.