here's my two cents worth
my T.e.vagrans is in a tank with three other females - two approximately the same size and one slightly smaller
I have never seen her express interest in another snake as food
she has been totally on pre-killed food ever since I switched them from minnows as babies
I am certain that she would have to be pretty damn hungry to even recognize the food potential in her cage mates, because her food always comes at the end of tweezers or chopsticks
and I do feel that they enjoy housing in groups