Katy, I am not trying to be rude, in any way, but both of these posts were made by you on the last page of this thread. I can understand, if JS was feeling all of the feelings and emotions you spoke of in your first post.
If he spoke to someone who helped him realize the truth, I do not see him being the kind of man, to leave a short message. I think from the controlling methods we have heard of him using, it would make him want to control this situation also.
If he left a message, telling her to leave, get out, etc., I believe that would have been a very long, humiliating and hurtful message.
Especially since Rebecca didn't have a recent missed call at 12:50 am from JS phone.
I don't believe any parent would be spending the last hours of their child's life leaving lengthy voice messages for anybody. We can only speculate as to the content of an erased message. Unless LE reopens the case, it will remain a private communication of which only the person who made it knows the content.
JMO