If there is no Profile Publish Access set for Coaches to see Students information then they will not see it displayed in the Roster Tab. 

To fix this, navigate to:
  1. Core
  2. Settings
  3. Profile
  4. Profile Publish Access
  5. Click Edit
  6. Mark the box for Student to Coach
  7. Click Save
  8. Click on Student to Coach
  9. Click Edit
  10. Select the fields you would like coaches to see
  11. Click Save & Confirm