@Charybdis Where was it stated that Shinnok woke up Daegon? Sure Shinnok had Daegon under his influence, but everything I've read / seen says that Caro woke him up after loosing connection with Blaze.
Shinnok somehow knew / learned of Argus' plot to save the realms, and began manipulating it to serve his own ends at some point. It is even plausible that Shinnok was the one who sicced Daegon on Argus and Delia, but I feel there is a lot of creative license being taken here as none of that was spelled out.
- Onaga's priests abducted Blaze to guard the last dragon egg.
- Caro lost "mental" connection with Blaze and mistakenly awakens Daegon.
- Caro instructs Daegon of the quest and sends him on his way (as this is what Orin did for Taven).
- Daegon learns of the quest presumably from an obelisk (but it could have been from his parents too, hell this could have been when Shinnok "corrupted him").
- Daegon gets SUPER pissed and slays his parents.
As a former Elder god, Shinnok most likely was consulted, along with the other EGs, by Argus about the plan to create a Quest. It is entirely possible that Shinnok knew all about everything, and was monitoring Orin and Caro, as well as Blaze, all along. But Shinnok had always had his own plans to take power. Multiple schemes he continuously works on.
It is most likely (in my estimation) that
after Shinnok fell from grace and rose to power in the Netherrealm, that this is when he saw the quest as a real means of ascension. At the same time though, he also had other plans in the works (e.g. regaining his Amulet, invading Edenia, etc.), so the quest was just one other (may be the final) mean of attack by Shinnok.
Also, in your write up you've put the creation of the Red Dragon, and their spread across Earthrealm before Shinnok and Raiden's war. It would seem that the Red Dragon didn't spread to / in Earthrealm until after Earth recovered from that war, and humanity was a major thing. I think that is further evidence that the Red Dragon wasn't created until after Shinnok's fall, unless they were headquartered in some other realm before Earthrealm.
So yeah, my take on the chain of events that from the Quests' inception to its corruption:
- Shao Kahn kills Onaga to take Outworld, then declares war on Edenia
- Delia receives a vision of Armageddon
- Argus consults Shinnok, along with the other EGs, on what to do about Delia visions
- Argus and Delia create the Quest and hide the brothers in Earthrealm
- Shinnok falls from grace after invading Earthrealm (Hmmm...)
- Shinnok raises to power in the Netherrealm
- The Dragon Priests abduct Blaze
- Caro awakens Daegon
- Daegon sets on the quest and learns what it is all about.
- Daegon kills Argus and Delia
- Shinnok corrupts the Quest (most likely by luring Daegon to the Netherrealm)
- Shao Kahn takes Edenia, then sets his sights on Earthrealm