Which is why it's not inconceivable that Efate has overtaken Regina in technological development. After all, the difference between TL12 (borderline 13) and TL13 isn't that big. But Regina has been the most important world in the subsector since 250 at the latest. The Regina Cluster is named after it. The Regina subsector is named after it. The Duchy of Regina is named after it. The subsector duke resides on it. That's not only a serious political advantage in itself, there's probably a good reason why Regina became the most important world in the region in the first place.
That's what I was saying (or at least trying to say), that the most important planet needn't to be the capital, as happens in cities in our Earth
(BTW: I hope no offense is taken by anyone from Baton Rouge or Tallahasse. Just trying to give examples. I could have given some Spanish examples too, but I guess US examples are more known by most of the people here)
But Regina was able to build jump-4 ships back before the 4FW.
And in that rules are twisted at least, as much canon as this is.
It's true the first Kinunirs in Regina where built in 1074-75. And the same Kinunir adventure gives Regina as TL 10 again in 1105...
It is what the most recent canon says. Check MGT:The Spinward Marches, p. 66-68.
I have no access to this book, so I trust your word.
No more a paradox than any two historical RPGs dealing with the same period making conflicting claims. One or the other is wrong. (or, of course, both, but let's not go there

).
Most those cases are RPGs using different rules and slightly different settings, or at least different points of view. Traveller canon tries to be coherent with itself, though not always as successful as all we would like (but if it was, what would all us argue about? :devil
Yeah, I took a pause from that discussion to ponder that. I'd never noticed that bit about advanced tech levels being limited to a handful of prototypes. I've always assumed that a world could be advanced in one or two technological field and not the rest. And while I can't dispute that your reference says what it says, I really don't see why not. The alternative is to list a world that is (for example) TL12 in all fields except one that is at TL13 as a TL13 world with ten of its 11 fields at one level below its High Common TL. And that would, IMO, be absurd. Surely the High Common TL of a world is the one a majority of its technology is at.
WBB tells that about TLs higher than th High Common (the one given in UPP), as some can be lower. The reference I've given is about those novelity TL (that cannot be higher than High Comon x 1.2).
Anyway, even if we accept Regina is TL 12 and its space TL is 14, that doesn't explain its TL 15 PP nor its Black Globe. The Kinunir is listed as TL 15, so above the capability of Regina's shipyards, and yet canon says they were built there...
No, but it means the canonocal timeline doesn't leave him time to do anything about it (Assuming for purposes of argument that he would have been able to do anything of the sort).
True, if you think this upgrading begining when Norris becomes Archiduke. It may after 3 years of housing a large TL 15 fleet...
After all, The first reference (AFAIK) to TL 12 Regina is just
after FFW, while references about it being TL 10 are
before FFW. If so, Norris just helped to consolidate it.
PS: all references to Kinunir I make are about Spanish translation, that is what I own. While I trust the translators (I knew personally most of them) and I can vow they love Traveller and won't betray it, I cannot discard some minor changes were made.