chin wing will only provide limited airway increase. look at posnicks text book, he always includes the gne (airway effect of gne and cw is the same), but he is clear that the most important factors are advacnement of max, lesser degree man, and then the nose procedures that he loves to do, ie straightening Septum, removing swolen tissue
i had a fight with mr doc, as he was trying to force me into Forward head posture, when we took the pics, it is amazing how Little the docs understand about posture, and that the true horizontal will be impacted once you have had your surgery in caqse this included in aggressive sagital bimax advancement.
now the kicker - your changed posture also Impacts your resting bite, ie it is super important that you arrive at the doc with as Little muscletensness in your face and jaw as possible, as this will otherwise distort the analysis