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if he were [a cleanup hitter] x [top 10 D-specialist]. He might need to log 15 seasons at that level, or 12.
We assume that you are talking about sustained .500 slugging and not just the occasional season at that level.
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Any truly game-changing glove, who is a legit MOTO hitter, is a great player. If Guti becomes a legit MOTO hitter he will be a great player, no argument.