Those bites were done during sexual intercourse with the victim. Ted Bundy was addicted to violent bondage porn (the root influence of his crimes). There is reasoning behind it.
Other than for the sake of disposing the body I guess you could dismember a victim for the sake of keeping it as a momento.
Seriousy David, you twist more than Chubby Checker! Anyone who mutilates a body would have a reason - it might be their reason but it is a reason nevertheless. Bundy was a paychopath and he mutilated the bodies of his victims because he enjoyed it. It wasn't to dipose of them, he simply enjoyed it and you initially said .....
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No they don't. Mutilation of a corpse for the sake of disposal/concealment is not bizarre at all. There is reason behind it.
Gaining satisfaction from mutilation you think is 'rational'? How is this distinctive from your claim that schizophrenic's mutilate? Your example states that the person in question decapitated her victim, Bundy also did this with 12 of his victims and kept their heads in his apartment. He claims to have eaten parts of his victims. Of course, I'm sure he had a rational reason for doing so