His plan, that he has stuck to for the majority of his lifetimes, was to just coverup the whole thing. He systematically erased Sariel from history, and until recently his main focus was preparing people for when Gyurie takes over as the core of the system. That's not a plan to fight Poti, not even a plan to undermine him. Thats just ignore, ignore, ignore, and eventually Gyurie will become our next life support system. As I said before, his plan completely fails, because the only thing stopping Poti from draining the last of the MA, and leaving this world, was his fear that he wouldn't survive tearing himself from the system, or becoming a god. He did nothing to help until Shiro forced everyone's hands.