Board Thread:Theories and Speculation/@comment-1872728-20160229033316/@comment-27660682-20160302031855

The thing about the Senju clan is that they dont have many unifing qualities other than having strong chakra and life force as well as being easily able to learn all 5 elements. The uzumaki bave their red hair and large chakra force as well as OP seals, and thd the uchiha have pretty defininig characteristics, the most defining being the sharingan. That would explain why the senju seem to no longer exist after the village formed.