
Originally Posted by
Rlinfamous
ANOTHER SENJU HISTORY/LINEAGE POST:
The Senju don't all have powerful Rikudou physical energies anymore, because apparently they've married into/joined with other clans over the years. They used alliances to gain access to more and more techniques, which is why they were called the clan of A Thousand Hands (which is what Senju means, I believe). That's also why the Senju (see: Non-Uchiha/Hyuga residents of Konoha) don't all share common physical traits.
The Uchiha, on the other hand, seem to have married within their own clan over the years, preserving their Sharingan. They seem to be much more prideful of their clan and their heritage than the Senju (they stuck together and always put the clan before others, while we've never really heard of the Senju even referring to themselves as such; they use Family names, not Clan names).
Even so, most of the Uchiha don't exhibit truly significant spiritual energies, any more than most Senju show strong physical energies. Despite preserving their clan's lineage and the strength of their Doujutsu to the best of their ability, the vast majority only reach the base Sharingan level. The rarity and power of the Mangekyou Sharingan, the highest level of Spiritual Energies, should be considered on par with the rarity and power of Hashirama/Naruto's level of physical energies.
In short, we shouldn't expect every Senju, or even very many of them, to be stamina powerhouses who can manhandle Bijuu and make plants grow with their life force. That's something unique to people like Hashirama, Naruto, and (to a lesser extent) Jiraiya. It's just like how Sasuke and Itachi were known to be exceptional brothers since birth; everyone's always known that Sasuke's eyes would rival Itachi's, because he clearly exhibited the full power potential of the Uchiha clan. In the same way, everyone's always been astounded by Naruto's stamina, and those especially in-the-know (such as Yamato/Jiraiya) are amazed he can handle the Kyuubi's energy.
For what it's worth, the Uzumaki preserved their physical strength about to the extent that the Uchiha preserved their spiritual strength (and to a far greater degree, throughout their clan, than the Senju). This is emphasized by the fact that they DO share a common clan name, and also all have similar traits (straight, red hair). It shouldn't be surprising that an Uzumaki, not a Senju, awakened the Rinnegan, or that the Senju needed to request Uzumaki citizens to become the Kyuubi's Jinchuuriki. The waning of the Senju clan's physical energies can probably be traced from the time they split from the Uzumaki clan.
Personally, I like the contrast between the Senju and Uchiha. The Senju embraced different clans, and found alliances to be the best way to gain strength. They lent their strength to others, and were strengthened in return, until they were undoubtedly the strongest clan. The Uchiha, on the other hand, felt their own power was the key to strength, and strove to raise their clan above the others. They could gain all the techniques they wanted through their own eye techniques, and didn't feel they needed anyone else. And in the end, it was Hashirama who decided that the best way to end the fighting between his most bitter rivals was to offer peace, and forge an alliance with the Uchiha. And, aside from Madara, the Uchiha eventually embraced his method.
It's just an extension of the Elder Brother's prideful faith in his own strength, and the Younger Brother's faith in friendship.
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