On the theory of how Nightblood relates to the Skybreakers- According to the Coppermind wiki (http://coppermind.net/wiki/Order_of_Skybreakers), one of the traits of Skybreakers is their innate ability to tell guilty from innocent. They value the law above all else. Isn't this basically what Nalan/Darkness has been doing when he kills surgebinders? He's trying to prevent the Knights from returning so as to prevent the desolation from returning. Sort of an ends justify the means ideology.
Wasn't Nightblood created for the sole intent of 'destroying evil'? I feel like that fits right in with the Skybreaker's mentality.
