Hi @anniecl Thought I would jump in for a brief moment.
It would certainly be worth asking about the experience of the surgeons specifically with Fibula Free Flap. This procedure was done up until only a few years ago by just a handful of hospitals and clinics worldwide. It is very specific, tricky, micro-surgery and is a day-long procedure involving several surgeons and technicians all working as a team. Complications can and often will result if the team is not well versed in this surgery.
I can only say from my surgery at Mayo, Rochester (MN, not NY) Dr's Ettinger and Arce who have helped develop these procedures now used world-wide have also the experience of well over a thousand cases specific of Fibula Free Flap Mandible Resection.
I for one have had excellent results, walking, talking, chewing gum all at the same time.