The interesting take-away that I see is that Granger somewhat surprised his officers with his decisive handling of the rogue Spanish sailor. As it was not a member of the crew, the crew would have no resentment, but would be reminded of the authority of the ship's captain. As they head into the stormy waters of the Cape, without radar, radio, GPS, decent navigational maps or any of the modern maritime aids, discipline may well be required in an emergency.
Phillips mention of rogue waves and the vagaries of the wind called "williwaws' blowing off the mountains was timely too. Hopefully, the Bacchante will not be found wanting if faced with such perils.
With rough seas, cold rations, and sea spray, misery seems to be their fate until they round the horn.