I worry that he may have changed his disposal method as well. Morgan was left in a hayfield that was not only extremely remote, but reportedly had hay that was
waist high. JM probably thought that there was virtually no chance that she'd ever be found due to those factors, but she was.
My fear is he may have placed Hannah in an old well or similar.
ksj3, I don't believe that Morgan's remains were "washed" anywhere or had moved in any way at all. Is this your belief, or have you read something about that possibility? I'd be interested to hear your theory or see any links.
Aside from never seeing any information suggesting that, there was black clothing and a bracelet found with the remains (sources
here and
here) that, IMO, very likely would have been displaced if her remains had been moved in any way. I have never seen any reports stating that her skeleton was disarticulated or missing any bones either, which again, would likely be the case if her remains moved.