My surgeon had his partner who is the director of the bariatics department as his assistant during the surgery. When I asked why (pre-surgery), he said it's common practice for them to assist each other. It was very comforting to me, because both doctors came to see how I was the day after surgery (at different time of the day- one morning and one afternoon.) And my surgeon is very skilled. He has been doing it for over 20 year with over 1800 surgeries performed. So, just ask your surgeon all your questions...I'm sure their is a good explaination.