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Pierre is not the only base thief lurking on the waiver wire. He's probably not even the best free agent speedster in your league. Pierre returns to the bench in July, so that hurts his value. Better options would be players that will play regularly into September. Better options would help more with the bat. Better options would play middle infield instead of outfield.
The following players could also be lurking on your waiver wire. They all project to 20+ steals for the season, but you can do better.