Leepe-Hoppe is doing what you are doing, hypothesizing. That is not fact.

Regarding the quote to Waking the Beast. You are only quoting/bolding a small segment of that entire cutscene. Of course the Celestial avatars feel more righteous than the Terrestial Avatars and humanity. If you read how each of them came into being Celestial avatars (Vana'diel Tribune). They are all pretty jaded from the world they left behind. That is not proof that Carbuncle is evil or has evil intent. Just because he needs the power of Celestial Avatars doesn't mean he shares their vision. He is simply a pragmatist. He knows their power will resurrect Fenrir and does it. He believes it will help humanity. You quoted it yourself.

Quote Originally Posted by Carbuncle, Waking the Beast quest
The sleeping gods do not exist to lead you... They exist to lead a lost god...
My friends and I are here for you...for mortals...
Nor is it proof that they are going to open the Gate of the Gods just because Shiva said "Those who came before shall remain, while those who came after shall perish..."

Quote Originally Posted by Zeargi View Post
Carbuncle tried to kill you, if he was so worried... he should have tried to HELP you and defeat the manifestations.
Quote Originally Posted by Carbuncle, Waking the Beast quest
Carbuncle: Thank you for bringing the shell of my avatar, <Player's Name>.

Carbuncle: I thought that you would never return to this place.
I threatened your life, even if it was for the purpose of defeating the sleeping gods.

Carbuncle: But you fought me with every ounce of your strength, and bent the power of those slumbering deities to your will.

Carbuncle: That is what saved us at the end.

Carbuncle: You were never meant to submit to the will of the sleeping gods.
And I will never lose my faith in the children of Vana'diel.

Carbuncle: Even those ancient beings will one day learn the great truth from mortals.
He didn't help you because he thought you wouldn't release the summoning.

Quote Originally Posted by Carbuncle, Waking the Beast quest
Carbuncle: <Player's Name>, you must dismiss the avatars!

Ifrit: How amusing.
Are you confused, mortal?

Ifrit: Did you meet us in battle at the behest of this creature?

Ifrit: Now it is clear.
Yet we will not be commanded by one such as you.

Carbuncle: It's hopeless...
There's only one thing left for me to do.
Defeat the summoner!


Carbuncle: <Player's Name>!
You cannot control them!
I'm sorry, but their connection to this world must be severed!
This is not the words of someone who planned this. Carbuncle did not expect the energy taken from the 6 Celestial Avatars to take form, or attempt to drain Full Moon Fountain. Carbuncle fought you because he felt it was the only way to stop the summoning as you can apparently be controlled yourself if your will is not strong enough. Carbuncle's words in these cutscenes.

Quote Originally Posted by Zeargi View Post
Because there are only 5 Mothercrystals. The reason is that the Deities need a median to manifest in. This is a Fact! Even in the tribune when they talk about the Celestial Avatars merging with something else. You can also see this in ToAU with the Iron Colossus and The Dark Rider.
No. There is no "deity" possessing a "median". Their names now were their names on Vana'diel before becoming Celestial Avatars. They became Celestial Avatars by the goddess herself.

Quote Originally Posted by Vana'diel Tribune: The Legendary Giant Titan
The Goddess, sensing Titan and Daemdalus's great hope, beckoned the two to the heavens by holding out her hand.
Quote Originally Posted by Zeargi View Post
The reason I believe the 5 terrestrial avatars are part of Promathia's soul is that:
He's referred to as the 'Twilight God,' not the God of Darkness, Not the God of Evil, the God of Twilight. Which means he is the inbetween of Dusk and Dawn. He also houses the lights of the Races, (Which could be the link to Carbuncle) He is the reason for the empty which inflicts eternal slumber (Diabolos). He is proven to become Shinryu, the God Dragon (Bahamut), Again He's the God of Twilight, so he also verges on the Night (Fenrir.) He can also be re-born (Phoenix). In Abyssea, you not once come across Bahamut, who commands All other Greater Dragons. Where is he? He already said that he'd plan to kill everyone if you failed. But magically, people are still alive, and there are still hordes of Greater Dragons roaming around. Where's Fenrir, He still would honor his pact, and have defended Windurst. Neither of these Avatars would have simple "Peaced out." Both are Prideful, and would have fought.
The reason he has the lights of the races is because he planted it there after Altana created the 5 races. Promathia, jealous of her creations, gave each of the races a flaw. Elvaan = Arrogance, Hume = Apathy, Tarutaru = Cowardice, Galka = Rage, and Mithra = Envy, as evident in the Ark Angels. Diabolos has nothing to do with the Emptiness, he feels it threatens Vana'diel when you speak with him in The Shrouded Maw, telling you to join his dream world to safety. If Diabolos was a byproduct of Promathia and the Emptiness, he would not fear it nor being a Terrestial avatar would let it harm Vana'diel.

Abyssea is the alternate dimension of what happened if you lost during the final fight of Chains of Promathia, Dawn. Promathia absorbed Bahamut and became Shinryu, which is why you don't come across him and why humanity is still around. Windurst is gone, the nations are gone in Abyssea, everyone is just wandering like Vagrants. You get this information speaking to the storyline related NPCs from the nations in Abyssea. As to why Fenrir isn't around in Abyssea, who knows. There's a lot of theories that could be crafted but just because Fenrir is not in Abyssea doesn't support a theory that all Terrestial Avatars come from Promathia.

Quote Originally Posted by Zeargi View Post
The Zilarts most like couldn't wake the Sleeping Gods, because they had no means to enter the crystals. You can't destroy the crystals from the outside. Drawing on the power will eventually wake that God. Proof: Odin. His Protocrystal was below Xarcabard, but he was Fully awake when someone summoned him as the Dark Rider to fight the Fully Awaken Alexander, but now there's no longer a Protocrystal there.
I refuse to believe the Zilart, with all of their advanced technology and structures didn't have the ability to construct a tuning fork (the ones you use to fight the prime Avatars and mini). Still not showing any proof that harnessing the protocrystals = opening the Gate to the Gods. We know how it's opened already, I don't see the point in theorizing an alternative way to open the Gate to the Gods except trying to convince that Carbuncle has evil intent.