When a teacher is added to your school profile, a basic profile with their name and phone number only is created for them allowing them to be instantly booked and managed via ClassCover.
From a school's point of view there is no difference between teachers with a complete or incomplete profile other than the fact that availability will not be updated until the teacher completes their profile.
As soon as a teacher has completed their profile, they will be able to view their booking calendar, update availability and will be given higher priority on your SMS shortlist and Book a Teacher page.