If I stick with my suspicions that Natalee met her fate in Jorans care, then all that remains is "did he dispose of her body by himself...or did he have help and who"...AND if he confesses, he is going to take someone to prison with him.
BTW, since his Father seemed to be in a coma that night, Joran could well have carried Natalee out to his OWN car and dumped her by himself...right?