Kishi is borrowing from star wars?! Oh dear. That makes sense now on the difference between madara and shisui. Those that go towards the light and controlling emotions end up like itachi and shisui while those who feed on their emotions end up like sasuke and madara. That explains a lot such as shisui's jedi mind trick, sasuke's burst of power from his negative emotions, and even why madara went from good guy to bad guy simply cause he feared for the safety of his brother which led him to the dark side. It doesn't surprise me but Im wondering why I didn't see this sooner. I guess that is also how they are gonna make sasuke powerful enough to face naruto even with the kyubi upgrade.
As for hashirama, not surprised since the last few times he appeared was when his emotions were mostly blocked and he was little more than a mobile doll under control by orochimaru. With his emotions restored the real him is coming out and explains why madara and him initially had such a strong friendship despite being rivals. It was only after madara went deep into the dark side after the death of his brother that convinced him to go the same route that sasuke is heading towards now. I guess the minato and hashirama will make that clear to sasuke in the next chapter.