Why does Sasuke's Rinnegan have tomoe?
Because sharingan power can be channeled through it
Obviously Sasuke has more Yin than RS ever had and Naruto has more Yang than RS ever had.
Kaguya - Superpowerful eyes and body
RS - Powerful eyes and body
Naruto - Superpowerful body
Sasuke - Superpowerful eyes
Sasuke got his own Yin which was already EMS, plus Indra's plus RS's Yin power. And Naruto already had his own Yang plus, RS's given Yang plus the Bijuus.
Sasuke awaken Rinnegan natraully unlike Madara.
Lmao Sasuke got the Rinnegan as a birthday gift from his Grandpa Hagoromo.