The Bite Victim is Michael Afton who DID get put back together as a cyborg, and he's got Ennard inside of him dawg because only Baby left when he vomited in the cutscene and the MCI inside Ennard stayed, and then he went to go free the DCI in the FANF 3 minigames and got spring-trapped, so there's Ennard inside Mike (who is the Bite Victim) inside Springtrap.

Afton just happened to be spring-trapped independently offscreen for FNAF 6 but he's not Springtrap and that's why he's called Afton and not Springtrap.

Molten Freddy is Yendo who got really mangled escaping the bunker because he got left behind and also he absorbed the DCI.

Evidence: it came to me in a dream