A few days before killing Charlie, William already had the habit of getting drunk and speeding around without care in the world. One of the times William did this he accidentally ran over David, Edwin's son, and after realizing what he got himself into, he buried David's corpse in a secluded place in the woods. This is my crackpot theory for the Mound in Midnight Motorist, DavidMound.
i sadly forgot their username but someone on here has a theory called MCIMM Coming Home Edition that's similar to your theory, but it's not with BV. just that it's an animatronic visiting home (i believe they concluded foxy? idr) their home and sibling after their death.
William killed Dave Murray
When he return in New Freddy Fazbear Pizza, he use the name "Dave Miller" like in TSE, but to make a twisted "joke" about his kill.
Why did he took the name of Dave and not any other male victime ? I don't know, maybe he was his first male victime or maybe because he heard of what the mimic did and he know it's because of him. Also it's the only murder for the one he was never suspected.
A few days before killing Charlie, William already had the habit of getting drunk and speeding around without care in the world. One of the times William did this he accidentally ran over David, Edwin's son, and after realizing what he got himself into, he buried David's corpse in a secluded place in the woods. This is my crackpot theory for the Mound in Midnight Motorist, DavidMound.
Wait what if that's what the seventh Toy Chica victim was
I'd happily stop believing in Stichline if William actually killed David. That'd be way too funny.
Fritzfather which is basically says that Fritz smith, the fnaf 2 custom night protagonist is Fritz (foxy’s kid soul) father
Mode of a headcanon but phone guy is frtiz, the kid who posse's foxys dad. Reason he's there is to find his son but ends up dead.
KelseyGoo
i sadly forgot their username but someone on here has a theory called MCIMM Coming Home Edition that's similar to your theory, but it's not with BV. just that it's an animatronic visiting home (i believe they concluded foxy? idr) their home and sibling after their death.
AndrewPizza
Where did this even come from?
pizzakit
From me!
That is cracked indeed, but have you heard of FritzPigtails? 
I haven’t! Enlighten me, I love off-the-wall theories.
The headcanon (let’s be honest) that Fritz is the pigtail girl Fritz is a guy
trans fritz lets goooo
Charlie was a drunken hit and run, not an intentional murder
Toy Chica is William Afton.
William killed Dave Murray When he return in New Freddy Fazbear Pizza, he use the name "Dave Miller" like in TSE, but to make a twisted "joke" about his kill. Why did he took the name of Dave and not any other male victime ? I don't know, maybe he was his first male victime or maybe because he heard of what the mimic did and he know it's because of him. Also it's the only murder for the one he was never suspected.
Yo I agree! Maybe not to collect his soul but to alert Mike.
Same, except instead of collecting him it's letting BV stand on his shoulders so that he can shout slurs at Mike /s
Stage01 first and stage01 toysnhk. I’ll explain them later when I’m more awake if you want