The claim that bodies are spread over several miles and that it hit the ground in once piece contradict each other.
I very much believe the facts of evidence are not yet pulled together enough to draw conclusions. Both Russia and Ukraine Army as well as Anti-Kiev forces will not take responsibility until the Investigation is completed sufficient to tell what happened. Until then Leaders and Politicians from all parties , both in the Ukraine theater of war and outside, will use this happening against one another.
However, an explosion as that could well scatter bodies....