I agree, he's a shinobi who is a perfect example of 'hard work pays off' and trained him self without the aid of Blood line limits. His arsenal is pretty original, RDS, FTG, rasengan, and S/T barrier. Rasengan.. well everyone knows he created it and uses it to its full potential with FTG, his regular rasengan is the size og Naruto's big ball rasengan portraying his chakra control. FTG in my opinion is created with his knowledge of Fuinjutsu, and added the seal to the Kunai. Space time barrier doesn't work without FTG as he can redirect the attack right back at you, although the mass of the jutsu matters on how much chakra you lose. RDS is also an insane jutsu he created, which has sealed the Kyuubi's yin, Hashirama, Tobirama, and Minato him self, which according to kakashi still has a lot of secrets behind. In my eyes, he beats anyone who has not been gifted anything, (Bijuu, OP body as in chakra or natural strength and physical/spiritual energy, blood line limits, OP weapons) Even if the people with these blood line limits were to get them removed and fight in their base, they would lose (even hiruzen).