Recommendation Letters

Hi there,
If I assign a teacher to a different school and then delete their original assignment, will they be notified?
Also, if I submit my application and my teachers didn’t finish their letters before the deadline, can they still submit? The common app site says:

The Common Application system allows recommendations to be submitted even after the application has been submitted. (nothing about the deadline)

Before you submit your application, please follow up with your teachers and counselors to ensure they will be able to complete and submit a recommendation prior to the school’s stated application deadline. You will not be able to make changes to the teacher/counselor list after you submit your application, with the exception of resending the notification to your teacher or counselor.
It’s not a straight answer but if I can resend the notification then doesn’t that mean they can work and submit late?
Thank you so much! Apps are so hard!!

They will not be notified on which colleges you add or remove them from. And yes, you can submit the Common App early before the recommendation letters come in. However, it is up to you and the recommender to make sure the letter comes in before the deadline set by the school.