But all right, I'll play along...this
is my sort of game, after all. If we ignore all intents and go just by what's onscreen, and interpret that the not-
K't'inga is merely a refit (or improved visual depiction) of the D-7 that merits no distinguishing designation, then we are left with the matter of it being said in "Prophecy" that D-7s were retired from service "decades" earlier, despite us seeing them in regular use beyond that timeframe. Even saying they were pressed
back into wartime service leading up to "The Way Of The Warrior" (DS9), and that the
Voyager crew simply don't know this because they were stranded in the DQ before it happened—which I'll grant, sure
sounds like an attractive theory at first blush—doesn't really work, because in "Heart Of Glory" (TNG) we see one in current service. So we have to make 13 years from 2364 to 2377 into "decades." Okay, it
is slightly more than a single decade, even if it isn't two...if we were talking 2358 to 2371, I could buy it.
Or we could always fall back on: "Tom Paris doesn't know what he's talking about, amirite?" Sure, but then we'd
still be left with Kor saying the
Klothos was a D-5 in "Once More Unto The Breach" (DS9) despite it looking almost
exactly like a D-7 in "The Time Trap" (TAS) and
nothing like the D-5 in "Judgment" (ENT). Now, we could readily explain
that by saying he too made a mistake, as he clearly
was going senile, after all. Or we could say he commanded two ships in succession called
Klothos, one a D-5 and the other a D-7, just as Kirk commanded two called
Enterprise. (If I'm not mistaken, it was I who personally originated
both of those theories back in the day.) Or we could just default to: "TAS is not canon!" (thus defeating the whole point of the reference in the first place) and/or "ENT is an alternate timeline!" or a visual retcon or whatever. Fine. We could indeed say all of that, and then on top of it all, say "DSC isn't Prime! It's a reboot!" Whatevs.
But personally, I would rather think of the D-designations as more analogous to something like the
V-designations of car engines (or perhaps even more apt, considering their origin, "four door" vs "two door" sedan body types) allowing more than one configuration to bear the same D-number, or indeed for two examples of the
same hull configuration to bear different ones. In "Prophecy" (VGR), Tuvok is
only able to identify the ship as a D-7 by its tetryon readings. In "Choose Your Pain" (DSC) the ship is
only identified as a D-7 by its warp signature. (And here we might further note that, in "The Augments" [ENT], we are explicitly shown that such signatures can readily be "faked" simply by reconfiguration of the warp coils.)
All three D-7s aside, this allows us to accomodate both D-4s, both D-5s,
and a faulty retired D-12 that looks identical to other BoPs of different class names that are still in service, to boot! So to my eye, that seems the most elegant and sensible solution, all things considered. YMMV. You're the guy that apparently
likes there to be as
many continuity errors as possible, after all...
-
MMoM