First of all, Hiruzen was called the professor because of all his techs, not God of Shinobi. The god of shinobi moniker was an indication of his battle strenght. The only other person who was called that was S06p himself. Nagato was self-proclaimed god.
Second of all, the Kabuto quote can be taken both ways. Either way it’s impressive because since it said in presence tense, I can only conclude that Hiruzen was stronger than all the current kages, in his old age (68-69 years old).Just Imagine him in his prime.
Thirdly, a lot of people fail to realize the difference between personal statements made in the manga(which can be biased, true nonetheless) and general consensus within it. The general consensus is that hiruzen was the strongest Hokage to have ever lived, hence the word reputation both Kabuto and Iruka used.
He managed to survive three wars, two as a leader, while holding on to Konoha’s position as the nr 1 village around. This also made him the longest reigning Hokage in history. He was trained by the first two hokage and he himself produced the legendary sannin(highly likely that he had 5 in everything in his prime).
Now, can Kishis’s opinion change? Sure, but until then the statements made in the manga/databook stand.This the onky legit way to find out what is true and not,and Kishi's words will always be superior to speculation.
Notice how it was said that the third raikage was stronger than his predecessors, not all the Kages. Kishi is very careful with what he says.
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