Is it possible for the GMI to change from time of initial receipt to closing? I assume if the borrower comes back to us and says "hey, I marked the wrong box," then that is fine. But if we made the mistake and corrected it later?

If the LO made a mistake when recording the borrowers responses, those should be corrected and the file noted to explain why it changed.

George, is it possible? yes.
Should it happen more than once in a blue moon? no.
As TMatt said, document and move on.

Thank you, you two! I appreciate it!