I always assumed Naruto got the large chakra from the 4th.

While on the subject, if Naruto is the SoTSP incarnate, would he got that from the 4th side or his mother side, if the Rinnegan is a trait from the Uzumaki clan? Being Naruto and 4th look a like now. :P

Sounds like continuity errors coming for the sake of story. :P Like to see the creator explains this later on.:P