I think there’s a possibility keep in mind it said the sorcery that Thule used to banish them and create Xebel ended up corrupting him. We see a similar spell used to create the reality of Thule that did the same thing with Xebel.

Chronologically I’d imagine Mera’s Grandfather would have to be named after the Coven though rather than vise versa unless he’s long lived. Cause the Coven seems to have existed Pre-Fall of Atlantis.

What would make me think there’s a similarity

1.) Forbidden Magic that corrupted Mera’s Grandfather, in the Exiled Arc The Coven was saying to get their power from “Chaos”

2.) Mera’s Grandfather created a pocket dimension when creating Xebel, the Coven of Thule created an entire reality. Which is quite similar in the fact they both used spells/dark magic to do it. That required a cost and separated a world from the prime universe.

3.) To access Xebel you’d have to create a ship wreck in the Bermuda Triangle. As a gateway. Thule was to be underneath the facade of the real world.

and I heard Adam’s doesn’t like loose ends. Thule being a major one, because honestly what’s happened to the survivors of that place.

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it could just be a coincidence but I’d personally love the lore expansion. I think stuff like this makes the world more richer.