So I was reading the Bacchae and listened to a few lectures when it struck me, it seems like Dionysus and the Ancient Bull of Crete may be the same thing. I have read before that Keos was a colony of Crete. It could also explain why in myth that Dionysus is presented as a foreign god. The devouring of Dionysus historically [in ritual] made me think back to something I also once read of women sacrificing humans in the Cretan Palace complexes to bull orifices. I was just curious if there was any other evidence possibly linking the two.
You might like Robert Graves Difficult Questions, Easy Answers. The blend of speculation, historical/archaelogical evidence, language study, and associative reasoning makes for an interesting read. He launches similar inquiry into the algebraic substitution/evolution of rites, worship, and rituals. Sadly it is all more or less speculative, and never distinctly deals with the Cretan bull god.