I agree it's persuasive, and IIRC the USSC is none too happy that the CAFC has condoned the prima facie approach despite the USSC already establishing precedent that the Graham method must be used. Think Markman may have mentioned in a blog that the USSC was waiting for a case like this to do a smackdown on the CAFC. Still a longshot, unfortunately - but Du creating precedent of weighing secondary considerations, with CAFC saying no precedent was set, shouldn't go over well if the USSC is really interested in enforcing laws.