He said i have a lower midline whereby my jaw is crooked to the left by about 2mm. I was also told i had "brachyfacial" growth pattern if that helps
OK, none of that changes my first response to your initial question which was:
Q:[My question is does having a wonky jaw mean I have an underdeveloped maxilla or is the surgeon just trying to add on money?] Davey
A:[It would mean the doctor MIGHT need to do surgery on the upper jaw IF moving it is needed to to move the lower jaw such that the teeth meet in the right occlusion.] kavan
If you are having a hard time processing my initial answer to your question as to what it could also mean. It means'NEITHER'.
There is NO definite answer to your 'EITHER/OR' question as to whether or not what was relayed to you 'means' EITHER your maxilla is undeveloped OR the surgeon is trying to add on money.
What I can tell you with your added info is that it still would mean that the doctor MIGHT need to do surgery on the upper jaw for valid reasons. One being for good occlusion and the other COULD be that you would look better with both advanced.
But no DEFINITE answer can be given based on both your questions alone; first and additional one here as to wheter or not your maxilla is ABSOLUTELY recessed.