Put it like this....naruto and sasuke are basically on the same side working for peace and all that good stuff right..i jave no doubt in my mind that sasuke really wants to lead the world to peace as a hokage so does naruto of course but this is where the so6p two sons come into play...like naruto and sasuke they both wished for peace but what was different is the ideology of how to get to peace which is what caused them to battle it will be the same for theses two it seems that with the shinobi alliance the world is moving toward being one! And the two people who will be front running for the kage spot are naruto and sasuke this is why they will haveto battle it out one last time