Theories on fnaf characters and thoughts/speculations

Mangle soul debate

A lot of people say that Mangle's soul is a girl the endo head is male while large masked one is female. The dog's soul is male. 
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Well, in 1983 fnaf4 barking could be heard. Now I don't think the Aftons own a dog as it would have been mentioned by GT or Scott. Since Susie was first. As UCN seems to confirm. "I was the first I've seen everything". In Fruity Maze Susie appears again in it. As the rounds got harder we see a dog that eventually gets what looks cut up. William tells Susie "he's not really dead" "he's over here". Now it makes total sense if this is being targetted at the dog as there's nobody else there. On a cutscene in UCN, we see Foxy tell Mangle "I'm going on vacation go feed the dog. Oh, wait you are the dog feed yourself". And another cutscene where Mangle asks to go the bathroom any human that had to go that badly would have just gone. Now finally in FNAF VR Mangle doesn't walk on two feet like the other animontronics he walks more like an animal. That's not the only time we see it in the minigame Save Them Mangle is the only one who is alive pacing left to right on the ground. The others aren't alive yet due to being the beginning (my opinion). This design is even kept in Mangle's quest.  Mangle does not possess any human noises yes in UCN he got a voice but, UCN is in hell and anything can happen there. Although Mangle has a dead kid in the cove that does not mean the kid possesses him there are dead kids all around the map. There's even a dead kid that's close to Bonnie the one on stage of course. But, he isn't moving or walking around like Mangle is. Although the dog appears once it appears in a minigame that's required to play in fnaf6 to get the lore keeper award. FNAF6 is tying loose ends so why would fruity maze display a dog for it not have any importance.  Like in FNAF4 what if William lured the dog into his house it would explain the barking we would hear. Once he killed the dog Susie was next.

If Scott didn't want Mangle to be possessed by a dog then shy would he keep this remember he made these cutscenes? If he didn't want the dog part he would have cut it out

Heres the dog that was killed he's got two things in common with Mangle. Missing an eye and being mutilated. As to the question since I know people will ask how I know the dog is male. Spring Bonnie well William who's inside it in Fruity maze tells Susie "he's not really dead" he's over here".

Any normal person asking for the bathroom would have already gone (even me)

I'm not exactly with this but, is Scott hinting that Mangle was created by Afton robotics aka William and Henry.