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Crowley was originally the angel Kokabiel and here's why:
Just looking at this definition of Kokabiel, we know two things: 1.) that they were the angel in charge of the stars, and 2.) the ended up falling. This screams Crowley, as in the first episode of season two we are shown Crowley in his angel form literally creating the stars. He also has a map of the stars in his hand, including all the constellations.
When the galaxy comes alive, Crowley is ecstatic! But when Aziraphale asks if he had done it all himself, he says "Ah, well, I mean, more or less. I wasn't... I wasn't, um... I wasn't the original concept designer, but I worked very closely with the upstairs on it," The "upstairs" in question being God.
Continuing on this theory, Crowley then explains that what he's created is a "star factory" and then launches into teaching Aziraphale about the creation of stars and constellations--much like Kokabeil was known for.
Once Crowley is let on that the "upstairs" is going to shut everything down in about 6,000 years, Crowley is mostly upset that his stars would die. He doesn't know earth by it's name, as he would most likely never have concerned himself with anything other than stars, and when he's told that his stars are only there for humans to just look at, he gets upset and ultimately starts questioning God--a slippery slope after all, because how much trouble can you get in for asking a few questions?
Well, a lot, apparently. Crowley becomes a fallen angel, like Kokabiel, and as we see towards the finale, he still has enough power to open up Gabriel's classified documents--something only a very powerful angel could do. This would align with Crowley being Kokabiel, since Kokabiel was the angel behind creating the universe and all it's stary components.
Not to mention that Crowley has dropped hints about his true name throughout the show, constantly bringing up that they could runaway together to somewhere in the universe both heaven and hell can't find them, or to alpha centuari--a star system in the universe. This hints that Crowley knows places in the universe that others do not (since he created it), and his desire to run away into the stars is just setting up reveal it is because they are of his own creation as an angel.
Ok so many good omens enjoyers have read The Doc making its rounds on here and I want to discuss the supposed hidden significance of the eccles cakes that op mentioned:
In short, I disagree that they meant anything important for season 3 because their symbolism was shown in its entirety through the context of the two scenes they are in.
The first we see of them is in the coffee shop when Aziraphale asks for something that calms people down, then in the next scene the cakes are shown, Crowley is leaving the bookshop in a barely suppressed rage. This leads the camera to focus in on a shot centering the eccles cakes, the established option to “calm down”, and Crowley’s glasses, basically the option to leave the bookshop in anger and go blow up outside.
I really think it’s as simple as that and that their significance is confined to these two scenes. I guess it’s a little peculiar that they vanished afterwards without being eaten, but what reason would Neil have to continue fitting them in without making them seem even more important than they are? Three is a pattern after all.
I think another big thing to consider about the end of ep 6 and Aziraphale’s decision to try and change heaven is what he just saw take place with Gabriel a few minutes beforehand.
His ex-boss Gabriel that, to Aziraphale at least, embodied everything wrong with how heaven thought and operated just had a complete change of heart and rejected heaven. So it’s possible that in Aziraphale’s mind, if one of the highest ranking angels had been able to change and reject the system, then it’s possible for everyone else in heaven to change as well. I think that’s also why he felt Crowley would have such a vital role in that change, because he believes there is so much to love in Crowley and he hoped that he would be able to show that to heaven and make them change too, just like he and Gabriel had changed partly because their love of a demon.
I think the Metatron kind of topped off that hope by making it seem that he was receptive to departing from the status quo as well. He mentioned that he too has tried human food and insists that Aziraphale indulges unlike the other, more uptight angels that belittled him for his interest in human delights. He then waxes off about how Aziraphale would be a great influence on and leader of heaven despite him going against heaven on so many occasions, which Aziraphale might have taken to mean that the Metatron would be receptive to altering the system to be more inline with Aziraphale’s philosophy.
So of course if both the Metatron and Gabriel, the two (or well, formerly in Gabriel case) highest ranking individuals in heaven sans God herself, had been open to change/abandoning the old heaven, then Aziraphale had a solid chance at changing the system to help everyone, especially Crowley and himself.
Just some food for thought