LE doesn't fail to disclose that remains have been ID'd for "fear of causing a riot." There hasn't been one time I can think of in which info was withheld about a victim being discovered/ID'd because of concern about how a community would react. I think that's fanciful thinking. The reasons that I've seen in the various cases I've followed (and cases I haven't followed) have to do with being able to ID the remains (which is the job of the ME and forensic anthropologists). Remains could be lots of people as there are many missing persons. But ME's and anthropologists they bring in to work on a case are not about "could be's." Not everyone has left a DNA standard behind for a ME to compare remains to. And that causes a problem. In HE's case, they would have her DNA from multiple sources. They would have samples of her hair (from her hair brushes @ home), they would have a copy of her dental records (and fillings are not necessary to make a positive ID, though they can be helpful), they would have the DNA of both her parents and sister. All readily available sources. If they run DNA tests they would know if the remains were her or not.
Since the remains were discovered fairly close to Disney World (i.e. a direct path) then it would not be unheard of that Disney-related stuff would be common for people to have who were in that area. Just because these bones were found in MM sheets does not automatically rule in the M's and rule out everyone else.
As for the M's keeping a body for 3 weeks on or near their property so they could then take heavily decomposing remains on a road trip to FL in January, along with their children, is just not realistic. Why would anyone keep remains around if they had any other recourse? These are not necrophiliac serial killers who secretly want to collect body parts. More likely that the M's disposed of HE's body as soon as they could, probably within a couple hours of killing her. IMO.