Clrnc Timber looks rather well suited to a hybrid role à la Zinny or Stones, you have to assume that's part of the thinking with him.
I admire White's qualities, but he's never gonna have the control and composure in close quarters that Zinchenko possesses. I have a vibe this will be the season we start to see a lot of tactical variation from Arteta—I don't think the "Xhaka role" is going to be what it was if Havertz is getting in the side either.