Originally Posted by
Nifft
The topic of the section is literally HALF-DRAGONS BEYOND THE MONSTER MANUAL, as you correctly report in your quote.
That is the topic of the section. It is about half-dragons (... beyond the Monster Manual).
On that topic, it is authoritative.
On other topics, it is not.
This is good, because as mentioned several times, the list of half-dragon parents in that section is not a list of all True Dragons in all published sources. If it claimed to be authoritative on that topic, it would be a rule dysfunction, since the True Dragons from Dragon Compendium / Dragons of Faerun / etc. really are True Dragons, and they're not on that list. Since it's not claiming to contradict that, there's no rules dysfunction -- it's just that the section is authoritative over a smaller scope than you'd hoped.
At least this is a new argument, but unfortunately it's factually incorrect.
One example (which is sufficient to disprove a categorical claim such as this): the Incarnum Dragon, from Magic of Incarnum, which was published in 2005.
Because the only consistent reading of the half-dragon list is that it's only authoritative over legal half-dragon types, and Dragonwrought Kobold is not a legal source for half-dragons.
... heh, or maybe they are, but the expression is as if the parent is the same type as the Dragonwrought Kobold's chosen heritage.
Dragonwrought Kobolds who choose a rare or powerful heritage would be very popular breeding partners if they could imbue their progeny with the blood of that dragon type.
That might be a fun dungeon: a heap of half-dragon beasts & giants, all the progeny of a very suave Kobold Bard.