Considering how different and less romance-focused the route seems from the other three, I'd argue that it could be THE main story, other than it does feel like more of an alternate path deviating from the main storyline (With the whole "I don't feel like talking to any of them" thing.)
I think the last part of Scribbles route
(Being actually Scribbles) would be the "canon" story with Therium being key characters in the route (Hence his route being Scribbles's part 1) the other routes are basically just optional developments for the characters you like.
(Who knows, maybe chapter 2 you choose what ending you got before starting the game :D, although that's still a bit away)