This is a good question. I’d say it’s his strength because its what keeps him going despite literally everything that has ever happened to him. He said it himself in sb with “I can feel their lives burning right here inside me, and till those flames die down, I can’t just do whatever.” But I think the weakness aspect comes in tandem with Chuuya’s low self-esteem. He “lets” himself get taken advantage of because he does not trust his own judgment /feels guilt for things that go wrong. He’s so responsibility complex that it’s become devotion.