Re: does a starfleet ship always have a CO with the rank of captain?
also in DSN we saw a Lt. Cmdr. (I think) in command of a Nebula Class vessel in S2. Dax was in command of the Definat in DSN at the start of S6.
On the continent of wild endeavour in the mountains of solace and solitude there stood the citadel of the time lords, the oldest and most mighty race in the universe looking down on the galaxies below sworn never to interfere only to watch.