Heavy guy charges/running with no abrasions to knees or legs or elbows on pavement falling forward getting shot?
Don’t think so.
If guy was static, yeah I’d say belly hit first.
And if he was running, he could easily have landed face first. But again, you seem to be making arguments based on facts not in evidence. Are there published autopsy results stating there were no abrasions, or are you making unwarranted assumptions?