Sharingan is a part of his Dna. Why not take away Naruto's Chakra pools as well? Even then, Sasuke is a far superior fighter.
At base, it would just be a repeat of this:
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Sasuke has the fundamental advantage. Naruto needs powerups to fight Sasuke, just like Ashura needed others to take on Indra.
Yes it is. Same as Rinnegan is base for Nagato and Byakugan is base for Hyuuga. Their fighting style is built around it so it is a part of their base.