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[VelKallor]

They could travel with an Atomos, just like we did.

They need to find a planar fissure ON THEIR SIDE.

Show me in which Quest Gaius got an offer to join us?

You didnt do the weapon series, did you

And Garlemald is gone, there is no Duty left.

Nope, you didnt do it.

He has 1 child, all others died.

Yes he does. And if you dont know how they died, go find out.

Erenville travels across all of Hydaelyn as a Gleaner, he would be perfect, if someone knows the World, then for sure him.

He isnt interested and never was. Even at the end of EW, Erenville remains to work in Sharlayan, free to roam as he wishes, working with the Forum.

You write like you are in panic that one of them would join us, like you would know them personaly.

Nope, just the facts according to the lore. Gaius would never join the Scions, theres way too much bad blood between him and virtually everybody. His past is his own to deal with, he has a lot of ghosts to lay to rest.

All but one of his adopted children dead, because of his actions. His encounters with Estinien notwithstanding, his personal duty is with Garlemald and its people.

From the wiki:

Despite this, he resolved to fulfill his promise to Alfonse by overseeing Werlyt's restoration as part of its provisional government. Sometime later, Gaius activated the memories Alfonse had given him and presented them to Allie, displaying holograms of their past and restoring her mind.

and

He realized that his presence would jeopardize the mission due to his reputation. He instead promised to defend Werlyt while others liberated Garlemald in his stead.

Try as he might wish, Gaius will never not be the Black Wolf..no one will trust him.

His duty lies elsewhere.