I always took the last supper to mean that sometime you have knowledge that you know is going to lead to your death, but you don't stop to worry about it, you make sure it gets done by someone you can trust to do the job. Sometimes your best friend is the one that has to sacrifice you, in order for the plan to work.

The idea behind the stories were so the peasants would understand what the morality really meant in the play. They didn't read, they didn't need to. They might know some marks, but they weren't going to be scholars either. So a story has to have its plot based on the reason you don't certain things. "Question the church" was always one, "Credo ut Intelligum" otherwise the info was no good they would tell you.