Almost nothing in the story line followed through the next two, it was a stand-alone movie. I should have said ‘both of them’ instead of ‘all of them’. Maybe the next one will be filmed in Canada as well.

I don't know about that... the primary motivation of Riddick in the second one was to help the girl from Pitch Black. She's in the prison mentioned in Pitch Black because she wanted to get eyes like Riddick had, which was something she asked about in Pitch Black. He finds out where she is from the priest from the first one. The Necromonger plotline was new, but that plotline and the prison plotline felt like they were from different movies.The Necromonger plotline was abandoned in the third movie (which was disappointing since I liked that part) and the third movie has more in common with Pitch Black than the previous Chronicles of Riddick movie.

I think it's more accurate to say the Necromonger plotline in the second movie was the outlier in the series. Which is unfortunate since I would've like to see where that went, but it wasn't a good fit for a "Vin Diesel is an awesome baddass" kind of movie.