If(when?) his AVG drops, then his HR and 2B will have to drop, unless by some miracle all his lost hits are singles. You justify trading Lee because what you get in return is greater than what you give. For example, I suggested in a 3 team deal trading Lee and Walker for Bradley, Drew, and Castillo. Castillo is superior to Walker, Drew is likely to equal if not surpass Lee's production next year(this is just putting names to production levels, so disregard Drew's injuries when evaluating this hypothetically), and Bradley is a superb offensive and defensive CF. The team is better offensively because of a trade of Lee in that scenario. You don't trade away one of the best all-around players in the game for an oft-injured player and a borderline nut. Yes, Castillo's superior to Walker, but Lee and Walker should get you more. Again, read the part in parentheses. It was an example to match the production levels we'd want to get in return with a name.