Not quite what I was thinking, rather another example of the 'Brazil nut effect'; once the wooden coffin had rotted away, along with the flesh, the bones would be free in the fill and, since the stones did not seal the grave - two were missing, in the report I read - the bones could migrate out of the grave. not in one mad rush but gradually as the earthquakes came and went, until the fill solidified, if it did. I can assure that I am well aware of gravity and how it works having been a victim on several occaisions

Though generally as a result of mixing chemistry with physics!
Did you see any 'monograms' on the peribolos blocks?
I doubt any bets will be being paid out for some time, Zebedee, Kassandros could have built it, but why no record? Amphipolis did boom, as you say and Aigai fell into decline, I wonder if the Antigonids did not have something to do with it; Gonatas does not seem to have founded a capital, as Kassandros, Lysimachos, Antigonos Monopthalmos, Seleucus etc did. Naturally, I didn't want to steal your thunder, no one else seems to have considered Rhesos, certainly I had not.
Hopefully, this week we will finally get the dating evidence and further details of the skeleton.
When you think about, it free-choice is the only possible option.