How Well Do the Pieces Cohere?

I love movies that seem to be incoherent, but make at least a decent amount of sense if you think them through.

Here you've got ...

1) The "sauce"
2) The white bugs that invade and take over a person, who then bursts days later, infecting multiple other people, by which mechanism an entire planet of people can be infected and converted in 100 days (this is presented as pure sci-fi rather than supernatural horror, as if the bugs come from outer space)
3) The terrifying creature that is lurking on John's apartment ceiling and that Dave eventually cages and shows to the reporter
4) The alternate reality that split off from ours, in which Korrok was created / evolved, and whose denizens want to invade and take over our world.

Clearly the sauce and bugs have some relationship, because "Robert Marley" was on the sauce and had the bugs. Yet clearly not everyone with bugs is on the sauce, and vice versa.

Folks who have read the book say that the bugs are from the Korrok reality, but that doesn't make a hell of a lot of sense, either.

In the movie, the creature in the cage is pretty much unexplained.

I very much like the idea of a genre movie that defies every expectation, especially that of the tight, well-constructed, logical story, but to really succeed at that, you've got to give the audience something else instead. I thought Kaboom did a great job of that. This seemed to fall short: the sum wasn't quite as good as the parts.

This was undeniably entertaining, and I am very open to an argument that if I watch it a second time, I'll connect some dots. But I don't get any sense that that would happen.

Prepare your minds for a new scale of physical, scientific values, gentlemen.