Continuing with the "Last Supper" references from the first episode, on the question tonight "Who is the Mole" the choice of names were listed A-K, and J was Paul. J = Judas

Also, not only was Judas the betrayed of Jesus he was apparently designated to keep account of the money of the disciples' (John 12:6)

This religious theme/Biblical imagery would mesh with the info Screerider posted above about the possible origins of the name Grassi being "a nickname from the Old French word "grace", meaning charm, itself from the Latin word "gratia"."

I think Paul Grassi is the mole