I was re-watching some old Wooden Potatoes videos the other day, and one of them was talking about the "Bloodstone Madness" and how that might explain why the Elder Dragons are so aggressive. Potatoes theorized that perhaps they've consumed so much magic that they became insane, that they developed a "need" to just keep consuming as much as possible. He also theorized that perhaps the Dragons are like "conduits" to specific spheres of magic, and that's one way they keep the magic of Tyria in balance.
But there's something that doesn't add up in that, or even the lore we know so far about the Elder Dragons. They _are _ an essential part of the Tyrian ecosystem, "The All." They keep the magic in balance. But they seem to be acting in a way that is...well...wrong. They're too aggressive to be acting naturally if they're a necessary part of balance in Tyria. And how could they have "magic madness" if their entire role is to consume magic? They should be immune to such things if they are behaving how they're supposed to. And this fact is echoed by Glint's own plan to replace them with beings that share magic rather than horde it. And by the fact that Glint herself was "cleansed of corruption" by the Forgotten. How could she be "cleansed of corruption" if she was behaving how she naturally was meant to? What was she "corrupted" with?
So, that made me think what could have happened to throw everything off balance and make the Elder Dragons insane? And then I thought: what if there were originally 12 Elder Dragon-type beings on Tyria, instead of merely 6? If something happened to the other 6, that would throw everything off balance and possibly drive the remaining 6 elder dragons insane. And perhaps those other 6 entities were the original 6 gods that The Six replaced? We know that humans can become gods merely by absorbing massive amounts of magical energy, typically by killing a god and absorbing their power. We saw Kormir do this in GW1, and we know that there was a god that predated Abbadon called "Arachnia." We also know that Grenth was once mortal, but absorbed Dhuum's power to ascend to godhood, although he did this without killing Dhuum.
Playing the cliff side fractal again made me think of something else: what if the very first humans secretly (secretly in the sense that none of the other races knew about it) came to Tyria much longer ago than we thought? Like, over ten thousand years ago. And those original humans killed five of the primordial gods and took their power? It's possible that was the ritual we were seeing in the cliff side fractal, that the Colossus was one of those primordial gods, and the Legendary Archdiviner was an early human attempting to take it's power to become a god.
We know that the original planet that humans and their gods fled was wracked by strife. Perhaps, after killing 5 of Tyria's primordial gods, Dwayna, Balthazar, Melandru, Lyssa, and Abbadon, returned to their world to use their new power in that war, which over 7 thousand years left their world uninhabitable, so they returned to Tyria with the surviving humans. But they realized then what they had done to the world thousands of years ago. So when Grenth went to defeat Dhuum, they knew they couldn't just kill him or else it would send the planet into further Chaos. Because since humans are alien to Tyria they aren't connected to "The All," and thus can absorb the power of a primordial god, but not take it's place in "The All" to maintain magical balance. So they had to imprison Dhuum (who had also perhaps been driven insane by the magical imbalance) instead of killing him.
This would explain why The Six seem connected to the Elder Dragons, and yet...not. Their power comes from a related source. It also would explain why the Elder Dragons seem to be acting in a manner contradictory to their purpose and nature, and why they're "corrupted." This also could set up the story for Guild Wars 3 after we've dealt with the Elder Dragons.