OK, now that you present the 'hard' info (the X rays), this certainly yields more information than 'speech'in so far as what I could put together based on your past many posts. For example, your first post emphasized the gummy smile and 'horse face' which stuck in my memory the most where such would be corrected via CCW anterior impaction. Also, it was only recent you mentioned lip DYSFUNCTION (lip incompetence) where as prior, you said your function was fine. So given that there is the presence of more 'hard' info where that was once absent, I'm happy to share some feedback with you.
Indeed, those cephs make it's much clearer that the maxfax did a net counter clockwise rotation in addressing the anterior open bite. The change in orientation of the ANS-PNS is there to see. You were used to seeing your upper lip somewhat hoisted outward via the outward inclination of the upper front teeth which will make it look shorter from frontal view. So, some CCW done in a revision surgery would give better support to your lip. But since the way you liked it before any surgery was a function of how flared out the front teeth were with the anterior open bite, I can't predict if doing so will kick up what you were used to seeing in the mirror prior but rather suggest you don't count on that.
In so far as CCW to the maxilla revision which he suggests, the mandible will rotate by pretty much the same degree the CCW to the maxilla is (approx). However a FEW degrees doesn't compensate for a very high angle mandibular plane.
As far as predictions go with regard to the chin, in particular with Gunson getting the chin to appear shorter in frontal, which he does to compensate for apparent longness of the face, he probably would want to redo the chin via a diagonal cut where it's slid upward where one vector of displacement that way is vertically SHORTER and the other is horizontally projected. IMO, that would look better on you and the right thing to do to help lip incompetence; strain in getting your lower lip to move up to close with the upper.
All in all, I think Gunson has a good capacity to IMPROVE on that prior doctor's surgery, give you better upper lip support, decrease the apparent excess length coming from the chin area and also make it easier for you to close your lips. But I don't think it's going to 'return' you to what you liked seeing in the mirror from ONLY the FRONTAL view which I mention in the event that's what you want to see it doing.