Was my lower jaw surgery for underbite done while my teeth were ready (in their right position)?

23 yearsold had surgery October and was looking at some pictures when I noticed that in some older pictures I had a worse bite than when I went in for surgery.Were my teeth ready for the surgery? if my upper jaw isn't underveloped, then when I used the elastics to fix my bite my teeth were actually pushed forward, thus making my lip seem like its pushed forward as well? And if my upper teeth are pushed forward and the jaw stays behind, is this the cause of my flat/sunken cheeks? see story below

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