Many First Gen fact aren't canon.

[Kirin The Dragon Sage]

The Shippuden facts abrogate the First Gen facts.

Minato isn't the strongest Hokage.

Hiruzen wasn't the strongest Kage among the five.

Hiruzen can't stop Edo Tensei summoning.

Hiruzen don't control all Konoha's jutsu ( he would be too cheated ).

Raikiri can be used more than 2 time.

Jiraiya isn't stronger than Itachi.

Ect...

Sorry to destroy the Prime Hiruzen hype , even if it was a nice fan's idea.

Itachi dont hv counter to Jiraiya genjutsu and senjutsu + sage toad summoning. Hiruzen still the strongest Kage (among all 5 nation) which in the same time believe that orochimaru is stronger than him. Orochimaru finish 2 kage is quite a feat dont you think? I still put my trust to see Orochimaru that said to master every ninjutsu existance. It's a hype but still it's kishifact.

 

[Darth AniCetuS]

It was mostly correct at that point of the manga except for Hiruzen knowing all the non kkg jutsus of konoha ino. As the story progressed a lot of things were retconned to suit the plot.

 

[Nidaime Suiton]

Itachi dont hv counter to Jiraiya genjutsu and senjutsu + sage toad summoning. Hiruzen still the strongest Kage (among all 5 nation) which in the same time believe that orochimaru is stronger than him. Orochimaru finish 2 kage is quite a feat dont you think? I still put my trust to see Orochimaru that said to master every ninjutsu existance. It's a hype but still it's kishifact.

Jiraiya is powerfull but it's obvious that Itachi is stronger than him.

Hiruzen was probably the strongest Kage among the five, but not when he was old , Ay and Oonoki were stronger than him , but Kabuto have said that " he is the strongest kage " and not " He was [...] " but we know that at this time , Old Hiruzen could do nothing against the Raikage or the Tsuchikage.

And If Hiruzen know all jutsu , then he know Hiraishin No Jutsu , but never Kishimoto has claimed that Hiruzen had this time space Jutsu.

 

[HyuugaHeir]

Just like Shippuuden ruined potential character arcs. Why? Shippuuden was basically Naruto Uchihafied.