Hashirama never said Itachi was a better shinobi in skill or power.That is what Itachi fanboys heard.Anyone who possess basic comprehension skills knows that Hashirama was talking about Itachi ability to go above and beyond the duties of a shinobi, sacrificing himself and his clan for the sake of ones village.
And Minato fanboys need to take a cold shower, Minato is great, but he's not better than Hashirama or Madara, and maybe not better than Tobirama or Hiruzen depending on what we see in the upcoming chapters.
Minato is jus GOD..Reason he has Kcm he has the Yin chakra and now that he is Edo he's able to handle that amount of Kurama chakra and use it like if he was a Jin...I wasn't surprised really i think before the next chapter he'll hand it over to Kurama and Naruto