If he has the right to retain ownership of a photo of a product he doesn't own... don't others have the same rights with regard to images of his own publicly displayed photos? After all, they didn't simply 'steal' his pic, what they did involved some editing. Where is the line where something becomes an original work of art?
Ultimately, the real owner is whoever is willing to spend the most in court.
You're talking about "derivative works" and, no, you can't do that either. The original creator retains all rights to those, as well. By definition, nothing already existing can become an "original work of art". If you started with something else, it's clearly not original. Make sense?
You are certainly correct about the court system, though. That's why this guy is using social media to draw attention to it. That's how David has to fight Goliath nowadays.