Erm, your chart says that Quincy is not related to the Belmonts at all, but a stranger who came into the family and probably married a woman Belmont. While the chart I posted says that Quincy was already related to the Belmonts.
but Portrait of Ruin destroys that interpretation in dialog by pointing out that the Morrises are NOT direct relations.
That is not correct. The script only says the the whip was not passed down the Morris line. Period. Also, the script for PoR does point out that the Morris are related to the Belmonts by blood:
Vincent: Why of course I have! They've used that whip for generations to destroy Dracula. And that family is related to the Morris family by blood.
Jonathan: Been doing your research, huh? Unfortunately, the fact is, we're not the true successors. No problem, though. I've won every battle till now without the whip. Not one loss.
The Morris seems to be as much Belmonts as the main Belmonts, bloodline speaking. The link between them being Trevor. YET they have not inherited the whip as main Belmonts have, thus cannot wield the whip as the main Belmonts can.
By your wording of logic, this is now just as authoritatively a fairyland alternate universe in which America never happened, the Soviet Union was an Australian nudist colony, Peanut Butter tastes like Strawberry Jelly, and the sky is green.
Which is PRECISELY why avoid as much as I can using real-world events NOT mentioned in the canon as point of reference for anything. Because IGA himself has already said that the Castlevania universe is a parallel reality to ours.
The mere fact that Dracula wasn't Vlad III fighting the turks but actually trying to kill off mankind by his time with an army of monsters is already an enormous hole in history. There is also the fact that, in Castlevania dimension, the Crusades started in the wrong year, and Franz Ferdinand was killed by a vampire.
Though I like reading the ideas everyone posts here, I ultimatelly recognize that the Castlevania universe has stark differences from real-world history that could jeopardize the entire thing if contradicting information from the canon surfaces.