I'd agree that 145 is at least HG on current tests. DYS doesn't really require a 145, just a 145 in VCI or PRI or GAI. A kid could be quite far from a FSIQ of 145 and still meet one of those requirements. DYS also requires AT of 145, but again with the same flexibility so that many different scores work and something like "broad math" might be 145 even withtout any subtest being over 145.
Sorry, so I couldnt find the quote marks as I dont write on this site very often... But I wanted to agree with the above point.
I think what is HG+ is really confusing, we can not nicely line up tests and say the same child will get 99.9% on WISC as on SB 5. The tests are different in their emphasis of "g" and SB 5 and GAI dont line up either. And there are questions over the validity of extended testing, especially using SB 5.
I personally FWIW think FSIQ 145 is really somewhere around Exceptionally to Profoundly Gifted. Beyond that, I think one needs to look at the numbers of ceilings scored, the raw data numbers plus look at achievement test scores as well as the child, to try and better understand that child's capabilities.
I agree their can be stealth EG/ PG kids due to personality (and 2es), but I am dont think their tends to be many stealth PG + kids, as they tend to give themselves away when they open their mouths and voice their ideas / opinions, or by the things they are interested in!
I also feel that it is not worth getting hung up on Davidson's definition of PG. At the end of the day, they are just one organization. More, I think, accept that most gifted kids, could benefit from enrichment, acceleration and advancement opportunities.