Basically each friend who's been captured has a character that you have to deal with in order to get them back. Buck bought one of Jason's friends for slavery/possibly to eat, the Dr rescued one of Jason's friends and is trying to heal her, ect. Each of those characters DO play a big role in the game.
After watching the new story trailer, I'm going to put my money on yes, he is a cannibal. --- They asked me how well I understood theoretical physics. I said I had a theoretical degree in physics. They said welcome aboard.