In Episode 10 - Crimson Killing Intent it is revealed that Kuradeel is a member of Laughing Coffin.
In Episode 8 - The Sword Dance of Black and White during Kuradeel's and Kirito's Duel there was a member of Laughing Coffin in the crowd watching the the fight.
I am wondering if Kuradeel joined Laughing Coffin before or after this Duel. if it was after was there any other reason for him to join aside from him wanting to get back at Kirito?
If it was before what purpose was there to have a member of Laughing Coffin inside the Knights of the Blood Oath?