How about Brett Lawrie? Showing a bit more calm and a much better approach at the plate, especially lately. Where he's most valuable is in the field, not just with actual good fielding, but with positional flexibility. Without him, there would be none of this insane platoon (SSS and regression obviously).
That's Troy Tulowitzki/Yasiel Puig level production we've got from this platoon when they have the advantage.