I know this is going off-topic, but...LF is where your least-talented fielder plays. (See Young, Delmon and Willingham, Josh.) First base requires a good glove but not a good arm or good speed. Lewis' talent would be under-utilized at either position, and we want to get the most out of our players. If Correa, Buxton, and Lewis are all on the roster going into next season something has to give, probably via trade.