FWIW, McCoy is introduced, production date and stardate wise, in "The Corbomite Maneuver" as an apparent longtime friend of Kirk's. He inexplicably replaces Piper...
...Bear with me, please. Yes, there's not much to explain there, but we could easily see things differently just for the heck of it. After the second pilot, which introduces Kirk, Spock and Piper, the ship would be at the outer edge of known space, having failed in her mission to penetrate the Galactic Barrier and having lost key officers. "Mudd's Women" shows the ship suffering from a fatal shortage of spares and crew resources, with Spock now pulling double duty as a Science Officer, Sulu at the helm, and Uhura in a department color we later learn is uncharacteristic for her. And in "The Corbomite Maneuver", the ship is operating in uncharted space still, that is, again doing explicit where-no-man-has-gone-before stuff. The situation does not markedly change in the following episodes...
We could see in all of this a slow crawl back to civilized space after the humiliating defeat at the Barrier, perhaps with Piper and everybody else halfway competent sent to meatier assignments while young Kirk is banished to do tedious star charting, now having to rely on his medical friend in need despite his many shortcomings, and of course on the stubborn Vulcan who refuses a career-preserving reassignment and sticks with the young loser. Internal reshuffling and stretching of resources keeps the ship going, until a chance adventure during another punitive assignment to the quiet Romulan Neutral Zone finally restores Kirk's reputation. And from that date on, Kirk can choose his company and retain even the abrasive and professionally lackluster McCoy.
Timo Saloniemi
...Bear with me, please. Yes, there's not much to explain there, but we could easily see things differently just for the heck of it. After the second pilot, which introduces Kirk, Spock and Piper, the ship would be at the outer edge of known space, having failed in her mission to penetrate the Galactic Barrier and having lost key officers. "Mudd's Women" shows the ship suffering from a fatal shortage of spares and crew resources, with Spock now pulling double duty as a Science Officer, Sulu at the helm, and Uhura in a department color we later learn is uncharacteristic for her. And in "The Corbomite Maneuver", the ship is operating in uncharted space still, that is, again doing explicit where-no-man-has-gone-before stuff. The situation does not markedly change in the following episodes...
We could see in all of this a slow crawl back to civilized space after the humiliating defeat at the Barrier, perhaps with Piper and everybody else halfway competent sent to meatier assignments while young Kirk is banished to do tedious star charting, now having to rely on his medical friend in need despite his many shortcomings, and of course on the stubborn Vulcan who refuses a career-preserving reassignment and sticks with the young loser. Internal reshuffling and stretching of resources keeps the ship going, until a chance adventure during another punitive assignment to the quiet Romulan Neutral Zone finally restores Kirk's reputation. And from that date on, Kirk can choose his company and retain even the abrasive and professionally lackluster McCoy.
Timo Saloniemi