Sorry..I don't know if this is the right place to post this. Today I just read about the "cenotaph" and having never heard of this word before, I looked it up....
"A cenotaph is an "empty tomb" or a monument erected in honour of a person or group of people whose remains are elsewhere. It can also be the initial tomb for a person who has since been interred elsewhere. The word derives from the Greek κενοτάφιον = kenotaphion (kenos, one meaning being "empty", and taphos, "tomb"). Although the vast majority of cenotaphs are erected in honour of individuals, many of the best-known cenotaphs are instead dedicated to the memories of groups of individuals, such as the lost soldiers of one country or empire."
So I believe MJ's "tomb" is a memorial to the MJ persona!