In some ancient civilizations the Wolf was a symbol of the underworld. In Egypt, the guardian of the dead was Anubis who was a wolf-headed god. The jackal portrayed as black was the symbol of both death and regeneration.
William is also the one who hid inside the suits and kidnapped and killed children, leading to the assumption that William Afton is The Purple Guy of FNaF 2 and 3 (he is killed at the end of the book when Charlie sets off the spring locks in his suit).
I believe Scott is talking about MatPats fnaf 2 video, rather than his fnaf 3 part 2 video, as he does continue on after he says part 2 to say Then part 3 came out, and once again the story was uncovered by the community.. Also, try to look at the whole phone guy and purple guy issue from Scotts perspective.