Batting leadoff in the majors is much more complicated than people think.
Team-first mentality can really hurt a guy's numbers in the 1 spot. Lead-off hitters need to be a bit selfish and go for the hit instead of the walk a lot of them time, and that's why guys like Drew and Pedey are not suited to bat 1st on a regular basis, Youk is a different beast because his batting eye is superior and his contact skills near Pedey level, but over the long run, it might be a better idea to try Ells or Lowrie at leadoff for the time being.