Wu Ya Zi as the leader of the 逍遥 sect, is the definitive fighter in the entire novel that possesses the full repertoire of the 逍遥 sect's skills.
He might have been versed in all other sects' skills as well, considering that he kept a vast library of almost kungfu manual imaginable.
Had he not been crippled, could he have bested Old Sweeper Monk?
What do you think?