Tulo gets more at bats if he's in the lead off spot. He really is only a lead off hitter once per game, maybe twice if it lines up right. With Reveres speed, if he gets on base, they have a chance to move him around and score with Tulo, Donaldson, bau, encarnacion, and smoak. If Revere hit lead off and they plugged Tulo down a spot or two, the rest of th top 5 would slide down meaning less at bats overall for them.