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The thing is with Saunders' glove he could be a dissapointment offensively and still be productive.
As long as he isn't a disaster offensively he won't hurt you, and if he pans out like Granderson you have a mini-star (better than Bay).
If he gives you a 750 OPS with great D in left, thats actually a better player than Lopez.
I wouldn't mind trading him at all for a different long-term LF, but I also don't think hes a gauranteed bust.