Is the requirement to confirm citizenship and provide a logbook endorsement required for those who already hold a pilot certificate?
Does another instructor's prior endorsement that confirms citizenship was verified act as a substitution for subsequent instructors, or does each instructor need to check and make their own endorsement verifying citizenship no matter what? This is with the assumption that there are multiple freelance CFIs rather than a flight school employing many CFIs who take turns teaching the same student.
If no, would that not imply that each flight review with a new instructor would need a new citizenship verification or are currency checks exempt?