Why not take him in? The UK and France already have their people, what's the problem with adding an American to the mix.
Especially when he's such a top-tier elite. You'd be a fool not to.
"You want me to work for you, from now on exclusively?"
"Yes, as an underground organization, I don't think you would want to test my loyalty, but rather focus on my abilities."
Xinfeng's thinking was a bit odd; he viewed and approached problems differently from others, and his entry points for solving them were completely unlike normal people's.
Ordinary people would seize the chance to demonstrate loyalty, but Xinfeng was emphasizing that Gao Yi need not consider his loyalty.
"The more a place stresses loyalty, the rarer loyalty is there. A small but efficient illegal organization does not need to stress such a thing, because benefits alone are enough."