Pedantic? No, I don't see it that way. Controversial,
definitely.
The only way I could see Kirk's "Tomorrow Is Yesterday" brag to Capt. Christopher of "there are only twelve like it in the fleet" meaning that the entire United Federation of Planets had only 12-13 Constitution-class starcruisers as of the mid-2260's would be if an older, pre-Constitution-class fleet of starcruisers had already been in service in the 2260's for a considerable period of time, and the "new" Connies were being built as the very first of "the next wave" while the older starcruisers, still in flight, are either slated to be decommissioned or to be rebuilt/recycled to the new Connie spec. For sake of argument, let's call this previous class of starscruiser the Magna Carta-class. (I believe
Warped9 is coming up with some ideas on what my "Maggie" idea might look like, although I would personally prefer something a little closer in appearance to a "Cage" Connie.) Taking cues from Matt Decker's Constellation, let's assume the Magna Carta-class starships were very structurally similar to the up-and-coming Connies, but maybe not as refined. Maybe the last spec for the Maggies gave them a sustainable top speed of Warp 7 for 24 hours, whereas the Pike's Connie could sustain Warp 7 for 72 hours and Kirk's revised Connie could sustain Warp 8 for 24 hours; again, for sake of argument. (I'm suggesting that Pike's Enterprise was a fairly new vessel when the ship visited Talos IV; whether Capt. April's command of the ship was to simply launch her or for a shakedown cruise before handing her over to Pike remains unclear.)
In this scenario, there could be 100 or more Maggies in flight during the 2260's, but only 12-13 Connies as of the "time" of Kirk's pronouncement/brag. This would mean that there would be
112 or more heavy starcruisers in the Federation's service, but that when you consider Kirk's point-of-view, he being in command of one of the relatively few Warp 8-capable heavy starcruisers at that moment in time, and in contrast to a much larger fleet of Warp 7-capable Maggies (presumably Decker's Constellation undergoing refit at that "time") Kirk could still brag "there are only twelve like it in the fleet".
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