Google cannot possibly tell original author from scraper site (unless you make complaint).
Not true whatsoever.
Simple methods exist but Google ignores them.
If the author of the content uses a sitemap ping and waits for Google to index the content before releasing it public, it's quite obvious where it appears first in the web.
Only the original owner would be capable of making that first sitemap ping, just wait a bit before releasing the content to make sure nobody else could register it in a sitemap withing a minute or so, real simple.
Oh wait, they could already do that and don't, assuming people are doing live sitemap pings for new content.