the strength at which a certain jutsu is performed at does not determine its rank.
A great fireball done by part 1 sasuke and a great fireball done by itachi against bee are both at the same rank, yet their strengths and sizes are completely different.
Hiruzen might not be able to do some jutsus at the same levels as nins who specialize in them, but he can still do them which would still mean he mastered every jutsu in the leaf.
The data book and narutopedia state that Hiruzen has has an earth and fire affinity, nothing more, nothing less, couple that with the fact that he used only those two against orochimaru, it is easy to conclude that Hiruzen in no way knew mastered or even learned all the jutsu in konoha since there are like 5 elements that we have seen in manga
And in no way did he master all the forbidden jutsu in konoha, otherwise he could have just blitzed orochimaru with Minato's ftg and killed him with rasengan or chidori, why waste all that chakra on those, as orochimaru said, pathetic jutsu that wouldn't hit him?
The bllodline limits and special abilities that can only be learned by people with bodies suited for those abilities are also impossible for him to use, like the inuzuka's shikakyu no jutsu, hyuga's juuken techs ( you need to have the enhanced body of a hyuga to do them) , mind tranfer of the yamanaka and body expansion of the akimichi, there is no plausable way for him to be able to know all this c clan secrete/bloodline techs. And he certainly didn't know hashirama's wood element, I can't believe that someone in this thread actually said that, as if? Than why didn't he just stop the kyubi with his wood element when it attacked konoha?
Let's not even talk about the mangyeko techs, sasuno'o, blaze release/amaterusu, tsukiyomi and Koto amatsukami, orochimaru was just babling shit when he made that statement about this guy mastering all jutsu in konoha.
He was just overating his sensei just like nagato likes to overate his sensei, jiraiya.
There is a long history of people overating their sensei's or people from their village in the manga. Like how Naruto and sakura said that Kakashi has a better nose than Kiba, but then we find out a few arcs later that he was talking bull when Kiba tracked sasuke even though he used a space time jutsu to escape, a feat that neither kakashi or his ninken, or even akamaru failed to match because they admitted themselves that they couldn't follow his smell.
Like naruto and sakura said that kakashi has a better sharingan than sasuke, but tobi, orochimaru, and kabuto all said that sasuke had the best sharingan they had seen and even said that it was better than Itachi's. Even worse is that Naruto and Sakura hadn't seen sasuke for a whole three years, how they made a comparison considering that fact is beyong me.
Jiraiya said that no one would ever escape his toad oso****us tech and implied that no fire tech would work against it but Itachi and Kisame escaped with ease and used a fire tech to burn it.
There are many others in the manga even form other villages that have either overhyped people with close relations to them or just overhyped themselves, orochimaru was just one of those when he made that ridiculous statement, Hiruzen was overhyped by oro and iruka, both of whom have strong relations to him, oro was his fav student and ihiruzen was a granfather figure to iruka just like he was to naruto if the flashbacks are anything to go by, the old man is strong but nowhere near what he is hyped to be, and even if he was as strong as they say, which I strongly doubt for many reasons I've already gone through in other threads, he definately didn't become that strong by mastering all the jutsu in konoha, that is pure crap.
