Sulu as Captain

[Yistaan]

Considering that 27 years have passed since The Original Series and The Undiscovered Country, it's absolutely believable that Sulu is a captain. In fact, I'm surprised that everyone else isn't a captain by then, given that Kirk's crew has repeatedly been called "the finest of Starfleet" and referred to as legends.

Current canon corroborates they did all become captains, although Scotty disappeared, McCoy went on to be admiral, Sulu was obviously captain, Uhura went on to become captain of the Leondegrance, and the only one we really don't know about is Chekov other than him starting a family with his son becoming Fed president