Jason;
I really believe that scrapers were not intentionally made to be scrapers. I think they were made mostly from wore out or broken points. Going to Artifact shows, you hear certain dealers selling marginal pieces, cheap, by giving them a cool name, and most of the time if you are a knapper you can see it is a long bulb flake or a preform. When you are knapping a lot you have too much scrap material to use to cut, skin or scrape a hide than to have to make a special tool you are only going to use a little bit.
I really doubt that paleo man went to the trouble to make cool knives like we post, just knock a long flake off and it works just as good, then you can throw it away, instead of having to carry it, since they were Nomadic hunters.
But, I really like the video, need you to show me how to do it.