Yes, PoD retconned Bane learning about the rule of two from Nadd, but it doesn't contradict Qordis becomign a spirit, nor Kaan. He still went there, otherwise how did he get his armor? Just because one element is contradicted doesn't mean the whole thing is wrong.
On that matter, Kenobi would beat Qordis with comical ease. All Qordis ever did was get humiliated by Bane and then get killed by Bane in a wtf pwnage matter.
Round 1. Bane is not sure about Kenobi but can feel nothing too powerful. He leaps into action with crushing blows and Kenobi is forced back, barely able to hold on to his Saber. As the round comes to a close Bane realises that his opponent's defence will be tough to break.
Before the end of the round, Bane has had enough. He focuses all of his energy into some sort of force push/crush/lift and Kenobi's defences are too weak to bear it.
Bane KO 1 via Hyper-Death.