Maybe. That wouldn't be a too far a stretch to think that Michael may have done that. He's a creep. Did you notice the notation by Patti Shook? I'm surmising that was Cyndi Shook's sister. She's the one who admitted that Michael was stalking her after they broke up.
You are right, he is a creep, but more importantly he is a perverted, disgusting torturer and murderer !!
They'd be left as residue after the cremation, it would be amazing if he didn't do it, it's just such a classy thing to do you know.