Earlier quoted context omitted.
I don't know enough about it to comment on it myself, but I saw comments elsewhere that apparently bruises appearing post mortem are quite common and those people appeared to think that was the likely cause of the bruises indicated in the autopsy. Found where I read those comments and it has also been updated: https://www.reddit.com/r/linux/comments/4rlar5/official_repo...
You don't get abrasions post-mortem, however, and if it were post-mortem bruising, you'd expect it in parts of his body that were lower than others. Having bruises and abrasions on his front, back, sides and face is not a natural thing that happens after death. It's a thing that happens when you're roughed up - if you read the autopsy report there are a variety of injuries that you'd have to try pretty hard to inflic…
The abrasions are predominantly on the left side of the body. If you imagine that he started the suicide sitting on top of the (left, from the view of the door) railing, facing forward, and then he fell off the railing towards his left as he fell, you can explain most of the abrasions by the railing or the balusters scraping him hard as he fell, ending up (as he was found) in a prone position, head facing upstairs. The upper right back and right front shin abrasions are the hardest to fit in geometry, though.
Without more detailed models of the house geometry and the bruises/cuts/scrapes on the body, it's hard to make a better judgement, but the evidence as it stands doesn't refute the official police report.