I've likewise killed a 2 1/2 year old 8pt that was rubbing trees bigger than my thigh. I killed on a cold afternoon in December following that rub line. The rubs stopped after his demise.

Just looking at the rubs I would have guessed him to be a huge old knarly buck. Some small bucks have a big ego.

I also don't think what you are seeing is a true scrape. You are seeing the area under the rub that he pawed away.