Yes, I agree, Richard Rapport is equivalent to a super grandmaster.
Not sure what he knows about the Kings Gambit--can anyone post the game he played against Adams? Or any other of his Kings Gambit games?
It is interesting, to me, that he plays or played the Kings Gambit.
I dont understand the point of all this but most of your assessments are wrong...
QGA inferior?
King's gambit with exf4 and g5 refuting?
1.e4 e5 2.d4 d6 not so bad and not sure white is better in your line.
1.d4 c5 2.d5 is the main move, but why the only correct one?
1.e4 f5, well, interesting line... lol
Anyway, it seems u understand all this more than GM playing these lines, and we could burn many books.