I'm not sure if you were really asking for an answer, but I am probably the least qualified person on the planet to give you one :)

On the basis of my reading of the information in the link I posted, creole is a family of langauges with at least 8 major and 20 minor sub-groupings.

I don't fully even vaguely understand the mechanism (or more probably, classification) by which a patois transitions to a creole. Perhaps it is simply a case of how many speak it, or how consistantly it is spoken over time etc.