Also Sierra is more of a 4th at best type outfielder. Might eventually develop into Rajai Davis without the speed. Not an ideal every day guy.
We have a lot more guys with upside coming up behind him in a couple years, so by having Melky there you can then transition into the Gose/Davis/Smith/Alford/Anderson phase instead of a filler guy like Sierra. Also I would definitely trade him if he contributes anything positively towards getting a starter.
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