If one surgeon told you that you didn't 'need' maxfax surgery, it could have been relative to not needing it to fix your bite.
If the other one told you that you DID 'need' surgery, it could have been relative to knowing that you started with an overjet (front teeth/upper jaw infront of the back teeth/lower jaw) because your lower jaw was recessed.
Both are correct in different ways.
In the event you wanted to pursue maxfax (bimax/double jaw) surgery, they would need to decompensate your bite. That means giving you an overJet so your front teeth are forward to your lower teeth which would allow advancement of your lower jaw. Your maxilla will probably have to be cut into also so they can adjust the bite for the teeth to mesh.
So, ya, you would be a candidate for DJS if you wanted to go through all the decompensation being in braces for some time to prepare for a surgery.
So, go back to the surgeon who said you were a candidate and request from him a PLAN as to what he intends to do.