Its so annoying that people use these fan-made songs as "evidence" and treating it as if Scott made them and the story to it is canon.

Like for example  I'm pretty sure we all have seen or have been told by gachas "Clara" died from car crash/drove off a cliff.

THAT  is copied from the (fnaf2 song It's been so long) which was created in 2014. which is way before Sister Location was even released.

The story is basically Puppet being Goldie's mother and that she drove off a cliff or got into a car accident after her son had went missing/died
They took the death scene in this song and slapped it onto the Afton mom and she does this after her son dies. The only difference to this is who the mom and son are.

Dance to forget (2017 song)

Another song that has been used to "canonize" things the whole William killed his wife and made her into Ballora. There is an animation of this song that has him killing her and transferring her into  Ballora with her tied to a chair still alive.
But you know "tHiS bE fNaF LoGiC  ThEy StIlL ❤️ OnE aNoThEr" or "ItS My Au bs" despite William taking her life and legit torturing her to do so.

I feel the whole Nightmare and Nightmare Fredbear are both CC's plushies and on a friend level likely originated from March onward to your nightmare (2015) 

They both exist at the same time and are opposites Nightmare being the bad guy and Nightmare Fredbear being the ally and trying to help. Of course Gachas softened Nightmare up so they could put him with CC as well as the plush ability. 

Soft William I feel he could've started off from these theories of being innocent if you've ever seen those. There isn't any songs that displayed him as soft last I knew unless you want to count Springtrap finale (2015)

Ennard living in Michael's guts

I feel this was ripped off of Alive Sister Location song by NightCove_theFox  (2019)
As well as Inside Us the first full animated song being in (2018)

It has matching details to what we see but instead of showing Michael going into madness  with the voices and knowing the funtimes are after his dad. As well as William calling him worthless.
They legit soften Ennard up and make it like it was meant to be, IT will always live in his guts. Usually he gets hated by William and called awful things. They don't really use the other details of the song.

The whole Aftons get reunited and supposedly are happy and living in their old house once again.
I'm looking at the Afton Family song(2017)
Again ripped off and softened up to make it happy and UwU.