Zetsu can hide their chakra. But sharingan will still see them.An example?
Same should go for karin.
The only way in the manga that was used to counter sharingan's sight is to overload it with chakra. Ie. Hidden Mist jutsu (mist made of pure chakra) or Aburame bugs.
I don't see the connection between how sensors sense to how sharingan sees. Even after reading the thread. Not to mention by sharingan basics his ninjutsu should technically be seen through. Using/bending light to hamper sharingan sight does nothing.
So either we're seeing chakra or we're seeing you