I'm surprised to learn that people from CodeWeavers work on Proton. Did Valve hire your company to develop it/help out? Are you using it as a base for CrossOver or the other way around?
CrossOver and Proton are rather independent as codebases, except they're both constantly rebased on Wine. Of course patches can flow in both directions (and from either to vanilla Wine, which is the best), but AFAIK none is systematically based on the other.
