But purely in terms of understanding his role as one of the Expedition's leadership. Yeah, sure, Ruprecht has his story. Everyone does. But in terms of leadership dynamics alone, I have serious doubts we'll find anything that changes the fundamental dynamics. He's a younger guy who is eager to prove himself and will default to more aggressive action because of that. He might have some story about his mother or how he came to follow his father's devotion to Ulric, and I'm sure it would all make a great character piece, but is it going to change which way he pushes when it comes to planning meetings? I do not think it will.
Ruprecht's story might be interesting, sure, though let's face it; it's unlikely to be as interesting as a tour of a skaven outpost. So in terms of competition between two actions, I don't think it'll be quite as interesting on the one hand, and nor does it have greater practical utility on the other.