Personally, I believe that some things mentioned or shown on screen should really just be ignored in favor of simple common sense, when those things are quite clearly mistakes.
TNG pretty much beat us over the head with the term "warbird" being exclusive
to Romulan ships, at least ships of the D'Deridex class. So the relatively few uses of the term later to describe Klingon ships are just misnomers, IMHO.
The K'T'inga model used in ENT's "Unexpected" was never meant to be used. The actual, more primitive-looking CGI battlecruiser intended for the scene was nixed at the last minute for something so ridiculous as the producers not liking how the lights looked on it. Having a K'T'inga in existence a century before the D7s makes absolutely no sense whatsoever. It should simply be ignored in favor of the more logical progression of technology (i.e. D5, D7, K'T'inga).