Zimmer is a defensive replacement and pinch runner, he almost never starts.
Tapia starts like 50% of the games. When one of the three starting outfielders needs a day off or a DH day.
Benintendi on the team = one of Springer, Gurriel, Hernandez, Benintendi, Kirk, or Jansen is ALWAYS sitting.
It's not really an efficient use or resources. Kind of awkward.