Users are acting like the DBs hold no wieght when Kishimoto writes them as fact, and I just decided to point out that the very same thing (approximately anyway) was stated by Iruka.
I'll post this one last time:
Page 117: "He is such a genius ninja that he was even called the 'Professor', and he still garners everyone's respect as the strongest Hokage in history." (「„プロフェッサー”と呼ばれたほどの天才忍者であり、歴代最強の火影として皆の尊敬を集め続ける。」, "'Purofessā' to yobareta hodo no tensai ninja de ari, rekidai saikyō no Hokage toshite mina no sonkei o atsume tsuzukeru")
Page 119: "'Strongest in history', 'genius', et cetera, the words used to describe the Third Hokage are filled with respect." (「„歴代最強”„天才”など、三代目火影を形容する言葉は賞賛に満ちている。」, "'Rekidai saikyō' 'tensai' nado, Sandaime Hokage o keiyōsuru kotoba wa shōsan ni michite iru.")
Page 265: "The Third is called the strongest, even among the past Hokage, and he is even admired as the 'God of Shinobi'." (「三代目は歴代火影の中でも最強と言われ、„忍の神”と謳われたことも。」, "Sandaime wa rekidai Hokage no naka demo saikyō to iware, 'Shinobi no Kami' to utawareta koto mo")
And that's just in the first databook. Both of the other ones state the same thing. Hiruzen being the strongest Hokage is indeed fact. I asked the guy that I requested the translation from over on the wiki if that included Minato, and he responded with this:
"Yes, I would say he's stronger —albeit not necessarily greater— than Minato, as well. If I'm not mistaken, '歴代' includes the current generation as well."
There's no doubt anywhere that Hiruzen is the strongest. All that has been going on is that Hashirama's strength has been expanded upon. Heck, the funny thing is, half of you are saying something along the lines of "Where's Hiruzen's feats?" or "Hiruzen is all hype" , yet that's all Hashirama has thus far gotten: hype.