And don't forget these ever so useful "blogs" and "conversations" between ArchieSonic characters once conducted on the Archie website, the ones that let us learn e.g. what happened to Jani-Ca and the cores after Silver's arc in SU ended.
Are those materials still around, by the way?
On a side note, I fucking love that story arc. So well done. Too bad I had to read most of the backstory on a website instead of the comic. Say what you will, but I miss the dragged out storylines and worldbuilding from the KP era of the comic. Nowadays this stuff is mostly pushed aside or condensed to one page every few comics. Not cool, man.