It seems odd to me that no bang was heard, and that the body lay there long enough to defrost, as one report says 'there was a lot of blood'.
I am no forenisc expert, but logic tells me that either this unfortunate person had not frozen, so was not dropped from a longhaul flight, or he defrosted after landing on the car roof, whch implies he was there a fair while.
Aviation expert believes he froze to death; it appears body fell out of hold
So the hold doors are opened in flight? Some expert.