Board Thread:Versus Debates/@comment-26958911-20151011204829/@comment-26537507-20151014103428

The way I see it, there's two possible interpretations:

1) Hiruzen knew and could perform every single jutsu in the leaf village. This is possible, given Hiruzen's hype but I personally find it unlikely because by that logic he should be able to perform medical ninjutsu and form a Strength of a Hundred seal.

2) Hiruzen knew exactly how ever jutsu in the leaf village worked, and could perform the majority to a high level. I find this more likely since because it makes more logical sense to me, especially when it comes to jutsu from the Inuzuka and Yamanaka clans. Also,