Give it up, tu quoque boy. There is no rule saying that in order to legitimately criticize Lincoln one must first make an equal number of criticisms of unrelated subject matter about Jeff Davis.
Oh, so we're back to musical definitions. Well, massa GOP, I can't hardly keep track of every time you change your mind about what tu quoque means.
Non-seq wasn't violating some neo-secessionist rule of argument (lol). He was refuting a poster's claim of non-bias, by pointing out no criticism of the Davis regime accompanied that of Lincoln's. A fairly uncomplicated chain of logic that even you would have difficulty disagreeing with.
IOW, it would seem you have squawked in latin prematurely.