Dugu Qiubai's life was epitomized by regret and loneliness because he couldn't find a worthy adversary. I just always imagined when the guy finally lights up, is when someone will have done something astonishing to his mighty record. If all it took was.... lasting a couple more stances than the next best guy, then it falls way short of my hope of the moment that Demonic Swordsman has been waiting for all his life.
But I do admit: it was a leap of faith to suggest that Ren Woxing would have made Dugu Qiubai block a stance. Yeah, Ren Woxing would have made Dugu Qiubai extremely happy, but who knows what else might have made him happy. All we can say is that Ren Woxing was near the very best calibre of fighters that Dugu Qiubai ever encountered.