And to make things worse, the translator who "translated" that in the OP is biased or trite.
The databook states that knowledge of jutsu is specifically within the realms of the five basic natures, not all jutsu overall and the same applies for his surpassing Tobirama (i.e. It was only in Nature Transformation) but that's kind of expected since Tobirama was his teacher, so all of the knowledge he had accumulated over his life is in Hiruzen's hands instantly.
So overall, all other Hokage solo him with their specialized ninjutsu.