1 Arthur Dane
It's a hard decision between Sir Barristan Selmy and Sir Arthur dane but as bold statement as this sounds I reckon both fighters are roughly twice as lethal as the King slayer. Arthur because he's pretty much as good with his right hand as Jamie is but he is ambidextrous so if he had a hand cut off he would still be as lethal as the King slayer.
It's a hard decision between Sir Barristan Selmy and Sir Arthur dane but as bold statement as this sounds I reckon both fighters are roughly twice as lethal as the King slayer. Arthur because he's pretty much as good with his right hand as Jamie is but he is ambidextrous so if he had a hand cut off he would still be as lethal as the King slayer.