I applied to all 3 programs and got In to all 3. I am currently attending Villanova's program.
Yes, you do need to complete all 3 undergrad supplement, but the essay for the medical school is the same for all 3 schools. It was redundant, but I had to send in the same essay/application for all 3 undergrads to the medical school. I think you can just send in 1 application, but I erred on the side of caution and just sent all 3 medical school applications to each undergrad. The reason for that is not all undergrads will forward your medical school application to the medical school so try your best to send in those med school apps to all the schools. Also, unlike some other programs, just because you get into the medical school does not mean you will get into all the undergrads you applied to and if you submit your med app to 1 school and not to the others, they will auto reject you because they assume that you changed your mind about the program/undergrad.