Royal Navy Lieutenant was superceded in 1769

[Kamante]

The attachment shows a 1769 muster-table entry (for HM Sloop Cruizer) for a Royal Navy commissioned lieutenant who was superceded. The usual meaning of "superceded" would be replaced. The attachment also shows that the lieutenant's servant was let go at the same time as of officer.

Was there any special Royal Navy meaning for "superceded"?

The word "superceded" is in a column entititled "Whither or for what Reason." The month and day are in the column "Time of Discharge."

[RobertHauteville]

Check the Pay Book and Captains Log to see if there is anything else there. If my memory serves me correctly there should be a section at the rear which gives details of arrivals and departures from the ship.

Also, how old was the Lt? Perhaps it should say "superannuated" which amongst other things could mean he was retiring due to ill health or age.

This doesn't mention supercession either but details the Seniority List system: https://www.napoleon-series.org/military-info/organization/Britain/Navy/c_flagranks.html

[Kamante]

Lt. Forster was age 28 in 1769 so probably not superannuated.