Re: Did we ever learn much about the original crew who died in Caretak
The Captain can appoint anyone to be Executive Officer and that person has authority over all other officers aside the Captain, even those who outrank him.
Position is a different concept to rank. For example, while captain of the Enterprise in Gambit, Data appoints Worf XO. Now, even though Worf is still outranked by Geordi (not to mention Crusher and Troi), his authority comes from his position as executive officer.
Similarly, even after Troi's promotion, Data remains second officer despite her superior rank and command qualification.
The Captain can appoint anyone to be Executive Officer and that person has authority over all other officers aside the Captain, even those who outrank him.
Position is a different concept to rank. For example, while captain of the Enterprise in Gambit, Data appoints Worf XO. Now, even though Worf is still outranked by Geordi (not to mention Crusher and Troi), his authority comes from his position as executive officer.
Similarly, even after Troi's promotion, Data remains second officer despite her superior rank and command qualification.