The first of these was formulated by 'Norm' in a comment on this blog. Mark, it is said, always sat suspiciously in the very same seat at the RumBar, pushing out conversations that seemed "tailored for a wire". 'Norm' "figured him for a skip" from the start, and these figurations soon extended to the goose-bump inducing conclusion that Jeffrey Lyn Cassman had been captured and flipped by the Feds before being sent down here to pen provocative blog posts and generally stir up Antigua's non-indigenous population of losers, drop-outs and fugitive felons.
Then, for want of a better term, there's the 'Jewish' conspiracy theory, outlined by 'George' on GuateLiving. Cassman it seems, sounds a bit like Finkleman, so might we not speculate that far from being the Opus Dei nutjob that he purported to be, 'Don Marco' was in fact a Christ-killing fifth columnist who, knowing that Hebraic tendencies are such an obvious marker for financial irregularities, decided to don the cassock of Catholic acceptability by swotting up on the Universal Church with the aid of such scholarly tomes as Catholicism for Dummies and The Devil's Final Battle and repeated viewings of The Passion of the Christ?
And lastly, and possibly related, comes the theory articulated by Elgordo (amongst others) that 'Don Marco' used his piety as a form of mind control, with particular emphasis on maintaining order, discipline and all-round submission at home, thus freeing him up to concentrate on the outdoor front where he went about his business like a lone wolf.
Have I missed any?