Help catching up on lore

I’ve been out of the Faz-loop for a Faz-second and I wanted to ask for some Faz-clarification on the recent lore of the franchise.

First, who is Andrew and why do people think he’s the vengeful spirit? I know his story and I know about the recent updates in theories based on the canonicity of the books and the Mimic but are there any clues at all that Andrew is in the games? Why would the Stitchwraith be randomly introduced in the books and then be the one to deliver Afton “justice” in the games in UCN? Plus, what about all of the Golden Freddy imagery tied to the vengeful spirit?

I know the books are a big debate and it’s starting to look like Tales from the Pizzaplex are canon(not 100% confirmed obviously) but are there any clues at all telling us that the Fazbear Frights are canon? Into the Pit is starting to be widely accepted as true but is there any connection between it and the main games and not just the fan game?

Why do I still see people accept Charlie as the first victim? It’s been made pretty clear from what I’ve seen that Susie was first with specific voice lines and especially the graves in Help Wanted 2. There is “a wound first inflicted on me” that Henry says but I feel like there is more evidence of Susie being first than Charlie. Do people just think that it was retconned between FNaF 6 and UCN and they try to theorize ignoring that?

I’ve been watching Hyper Droid’s stuff so I’m on the Dave train and I’m pretty good on the Mimic arc so far but I just need help with figuring these out so I don’t get Faz-confused.