3rd
4th
1st
2nd
5th
6th (Kakashi/danzo)
what kabuto said is just hype, and it was in no way a comparison to the so6p's power. It was just a statment saying that people now have a hard time believing how powerful hashirama was, just like the so6p. Because imagining someone who can spam forests is obviously a big deal. Equating what Kabuto said to a so6p comparison would be like inferring that Naruto is close to his level just because Kurama uttered his name.
imo, nothing has changed. EMS Madara as he was shown against us was nothing out of this world. Ridiculously strong, yes. Beyond Akatsuki level, yes. But Nagato could have beaten EMS Madara, if not Itachi, and i'm fairly certain Sasuke and Naruto could have too, as well as a few hokage. He had nothing on his prime state, as evidenced by the fact that a Naruto clone and Gaara FORCED him to progress to the rinnegan practically a minute into the battle.
Anyway, Kishi himself said Hiruzen was the strongest hokage, and he was titled the God of Shinobi like the so6p. And Minato was stated as unsurpassable by various characters and by Kishi himself in an opening page in the kyuubi incident, so they are no strangers to ridiculous hype either.