We know you get the rinnegan by mixing Indra and Ashura's chakras to get Hago's chakra.
Madara's Indra and Hashirama's Ashura chakra mixed. Madara had to wait a very long time before his rinnegan came out. His eyes could naturally grow accustom to the new chakra in his body.
Sasuke's Indra and Hashirama's Ashura chakra mixed. Sasuke kinda prematurely awakened his by being put through a near death experience which is why his did not mature naturally in the same way Madara's did. Sasuke has the power of two rinnegan in one 1 which is the reason for the tomoe.
Just a theory.
Madara's Indra and Hashirama's Ashura chakra mixed. Madara had to wait a very long time before his rinnegan came out. His eyes could naturally grow accustom to the new chakra in his body.
Sasuke's Indra and Hashirama's Ashura chakra mixed. Sasuke kinda prematurely awakened his by being put through a near death experience which is why his did not mature naturally in the same way Madara's did. Sasuke has the power of two rinnegan in one 1 which is the reason for the tomoe.
Just a theory.