Ashura was supposedly a talentless hack with no genetic prowess like his brother(aside from maybe stamina) that could only get on equal grounds with Indra with the help of many people.
Down the road, his training unlocks him strong vitality that he somehow passes on. He and his descendants went on to become the Senju. The Senju(literally "Thousand Skills") has theoretically kept up with Uchiha through use of many various justu alongside their vitality, but this still doesn't explain the two being equal for multiple reasons:
1. Many Senju died in their youth and it's not like young children are born with the justu of their parents.
Senju are most definitely late bloomers due to the fact that justu is something that's learned over time, so this is major. This definitely applies to to the Uchiha too, but Uchiha have the benefit of possibly awakening Sharingan from this fact.
2. The Sharingan can pick up the Senju's justu faster than their own children could ever hope. There was definitely no shortage of it during a war that spanned centuries.
3. Both Uchiha and Senju used cooperation, so no one is edging the other out with it unless Senju bred like mice.
Even then, Madara had 4 brothers himself(
It all boils down to the fact that neither the Senju's vitality or the Uchiha's chakra has any real edge over the other to begin with(Tobirama vs Izumi), and as one progresses with time(Sharingan), the other does too(justu). This introduces the problem that as the justu user progresses by learning more justu, the Sharingan user does so too and more efficiently through copying and gaining tomoes to slow the world around them. It also rests on the assumption that the Sharingan user only advances their Sharingan and spends no time training.
"Uchiha probably can't compete with the Senju's use of justu because they don't have fat pools of chakra for it." Or so you would think, but Madara could already wipe out multiple adult Senjus(
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1. Many Senju died in their youth and it's not like young children are born with the justu of their parents.
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2. The Sharingan can pick up the Senju's justu faster than their own children could ever hope. There was definitely no shortage of it during a war that spanned centuries.
3. Both Uchiha and Senju used cooperation, so no one is edging the other out with it unless Senju bred like mice.
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).It all boils down to the fact that neither the Senju's vitality or the Uchiha's chakra has any real edge over the other to begin with(Tobirama vs Izumi), and as one progresses with time(Sharingan), the other does too(justu). This introduces the problem that as the justu user progresses by learning more justu, the Sharingan user does so too and more efficiently through copying and gaining tomoes to slow the world around them. It also rests on the assumption that the Sharingan user only advances their Sharingan and spends no time training.
"Uchiha probably can't compete with the Senju's use of justu because they don't have fat pools of chakra for it." Or so you would think, but Madara could already wipe out multiple adult Senjus(
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) before gaining even a single tomoe due to being Indra's reincarnation despite also being too young to have many justu. Madara and Hashirama are definitely outliers, but there's still the fact the reincarnations are far stronger than the rest of the clan & their difference in mentality should mean the death of the Senju. All the Ashuras we've seen thus far were super reluctant to kill, while the Indras didn't hesitate to do it. Shouldn't Indras wiping out adult Senjus create a serious imbalance from the fact that it would result in more adult Uchihas(that should already be more capable than adult Senjus) than Senjus?
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