That isn't Xhaka's role though, it's Palacios and Andrich more. So for Xhaka, Kimmich definitely plays. Palacios is the only player I would have a conversation with because he is really talented and doing well. Would you seriously say that if Bayern went to Leverkusen and said give us Andrich or Xhaka and we'll give you Kimmich, Leverkusen will say no?
Xhaka is basically the anchor, if anything Kimmich would play Palacios role. But both are required to be very disciplined to not expose the backline. And they are expected to resist the urge to play through balls all the time and keep it simple. Another thing Kimmich isn't particularly good at.