Abdula.
Payne and Madare came both from Kishi's ass, Madare at least made sense at some level (there have been speculations of a 2nd shooter in the uchiha massacre), while Payne comes from an unknown time, without any connection to anything.
Madare orders Payne around, at least for now. Madare is the one with connection to the tailed beasts, at least it seems like he has a plan. Payne, on the other hand, wants to show the rest of the people the sadness he feels inside, I assume that he writes poetry about his woe.
the fact that you and me don't understand the weakness doesn't mean a thing, we didn't understand the code writing either. the characters in the story understand, and it figures that eventually "the real one isn't there" will become the ultimate strategy to defeat payne, even if it makes no sense what so ever. Madare's weakness was supposedly known by Itachi, but he couldn't kill him with the triggered amaretsu.
I can't say anything about the 3 years delay of the plan, it never made any sense. and as each chapter passes, it makes less sense.
Ultimately, I'm hoping that there will be another 'villain-level' after this one, the akatsuki had potential to be the final enemies, but they ruined it by dying too quick, and being jerks.