So on a serious note I describe "Homestuck Canon" with an analogy to holy scriptures. I'm Jewish so I liken it to "Heres the comic, think Torah," followed by "heres common headcanons and discourse blogs on characters/mechanics" similar to Talmud/Oral Torah and go from there. I consider works like "Whistles," "Special Olympics," and early Hussie short films with her and her brother as the "primordial g oop" that informs what we have decided as canon (the comic itself) because it informs the Homestuck text. Just like there was shit before ppl wrote down the book we decided was "Canon"/the central text, the Torah has it's historical beginnings with influences from polytheism, pre-nation state politics and Zorastrianism.