Did you notice that when Hashirama and Madara were young during the Warring States era, ninjas used very basic moves, and essentially used kunais, shurikens and swords ? You can see it in the flashbacks of Hashirama.
And even Hashirama and Madara when they were young adult, they still relied on their Kenjutsu, and their jutsu were still basic.
At one moment, Madara and Hashirama started to become overpowerful shinobi using many sophisticated jutsu. And in the other hand Tobirama developped very complex and strategic jutsu such as Hiraishin, Kage Bunshin, Edo Tensei and Gojokibakufuda. This is why Tobirama is so renowned for these jutsu, because before him, there weren't so such complex jutsu. A thing like Kage Bunshin appears like casual in the modern days of Naruto, but at this time it was really something great.
In my opinion, is that at Butsuma / Tajima's era, only elites shinobi could use ninjutsu, and their jutsu weren't so complex, Butsuma probably used basic suiton / doton, and Tajima basic katon and genjutsu. They relied mainly on their Taijutsu and Kenjutsu.
When Hashirama and Madara came, they totally revolutionized the Ninjutsu. Since Hashirama / Tobirama and Madara / Izuna, ninjas, at least in the land of fire, use more sophisticated jutsu and relied less and less on hand-to-hand fight.
You can also notice this difference by the fact, Hashirama, Tobirama and Madara abandonned their basic sword. During the 4th Ninja War Madara used his Taijutsu only to humiliate the shinobi alliance.
Ashura and Indra were exactly like Hashirama / Madara and Naruto / Sasuke in term of power, but I think for some reason, their teaching had been lost.
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And even Hashirama and Madara when they were young adult, they still relied on their Kenjutsu, and their jutsu were still basic.
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At one moment, Madara and Hashirama started to become overpowerful shinobi using many sophisticated jutsu. And in the other hand Tobirama developped very complex and strategic jutsu such as Hiraishin, Kage Bunshin, Edo Tensei and Gojokibakufuda. This is why Tobirama is so renowned for these jutsu, because before him, there weren't so such complex jutsu. A thing like Kage Bunshin appears like casual in the modern days of Naruto, but at this time it was really something great.
In my opinion, is that at Butsuma / Tajima's era, only elites shinobi could use ninjutsu, and their jutsu weren't so complex, Butsuma probably used basic suiton / doton, and Tajima basic katon and genjutsu. They relied mainly on their Taijutsu and Kenjutsu.
When Hashirama and Madara came, they totally revolutionized the Ninjutsu. Since Hashirama / Tobirama and Madara / Izuna, ninjas, at least in the land of fire, use more sophisticated jutsu and relied less and less on hand-to-hand fight.
You can also notice this difference by the fact, Hashirama, Tobirama and Madara abandonned their basic sword. During the 4th Ninja War Madara used his Taijutsu only to humiliate the shinobi alliance.
Ashura and Indra were exactly like Hashirama / Madara and Naruto / Sasuke in term of power, but I think for some reason, their teaching had been lost.