And to make things clear that back then the Blizzard Dev team used skeletons from player races to make many of the other races, to include early Goblins were a skin over the Dwarf skeleton. No one has ever though that Goblins and Dwarves were related, because the re-skin job made goblins look like Goblins.
The Jinyu do not look like Night Elves, the Goblins do not look like Dwarves, but the Qiraji look like Night Elves.
I don't even know why I'm arguing this since as I said there are three plausible theories for the Origin of Trolls, Night Elves, and Goblins. the AQ theory is not even my favorite one, but it needs to be pointed out because it is just as plausible as any other.
Also many of the 'Lore' statements you have said to be true do not come from the game.
Trolls were not around before the Titans, that is a misunderstanding of what is said.
Azeroth was made by the Titans, however when the Titans finally settled on Azeroth they found that corruption had settled Azeroth. ie the Old Gods.
We have no idea what the time scale if and have very few bits of dialog in game. What is clear ALL player races are descended from Titan Creations. Which means Trolls do not Predate Titans, and if there is a link to Qiraji and Night Elves, it is possible that the Qiraji are a corruption of Night Elves. After all 2k years ago when the AQ first attacked, that land was Night Elf Territory, and the bugs over ran several night elf communities. ie the Twins might be former Night Elves.
Major clues that the Titans made all player Races:
Elegon- Touch of the Titans- Contact with the Energy Vortex transforms the target into celestial form, increasing all damage done by 50% and healing done by 50%. Pets get the bonus but are not transformed. .
Paragons of the Klaxxi - "Come, children of the Titans, you face the Paragons."
this picture is a big clue.
From Ulduar in an area showing various creations of the Titans.
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Pandaren were reshaped into slaves by the Mogu, because the Mogu reshaped all 'inferior races' to make them better servants.
So in this the Pandaren as we know them today are created by the Mogu.
However the race that became the Pandaren existed long before the reshaping of Pandaria, long before the Mogu Empire. It has been said by Dev team members that they use to be Furbolg, which are very similar to Pandaren only they are very primitive. Although they do like Beer. Ironic that back in Vanilla Furbolg had Beer, and now Pandaren are great Brewmasters.