It might've been, but BB is a smaller animatronic which means his mouth is smaller. I don't think it would make since for it to actually somehow bite someone's head when it's mouth is that small.
I think the third game will be before FNAF2, like Fredbear's Diner. I actually made an FNAF OC of a wolf that was blue, and a fake Scott account there was a wolf that was posted. (An Animatronic that was fake) It had the same name as my OC, Wolfy. But it wasn't a girl. I think The Mangle caused the Bite of 87. Maybe FNAF3 will be 30 years later than all of them.
There is that one secret, "30 years later, only one left," I think that they scrapped all of the animatronics but Shadow Bonnie was an actual animatronic and is the only one left.
(Sorry it's all scrambled up)