Board Thread:Naruto Discussions/@comment-25442710-20140920121351/@comment-25343176-20141001150258

Even having six paths chakra and having only one piece of sage will only allow u to reach the full potential of what you have. Naruto and sasuke are examples. Naruto only possessed the sage's body so even though having six paths chakra, he wasnt even able to awaken rinnegan cause he didn't possess a dojutsu. Same goes for sasuke not possessing the body. Madara is different cause he was actually able to steal a portion which is why i think he is different possessing body and eyes.