[Despite how coyly he asks it, he does give Diluc's response careful consideration. And he nods with affirmation, because that observation lines up with what he sees in their own relationship.]

It isn't. Trahearne and I had duties that were tied in their purpose, and so when he was destined to lead the fight against the dragons as Marshal of the Pact, he made me his second in command. We had gone through much together, before...

[He purses his lips. He doesn't know if Diluc is among those Trahearne has admitted to being dead to.]

... And we Sylvari have a deeper empathetic connection to each other. Especially here, when he is the only other sibling close enough to feel. I know him very well.