During the retsuden novels kakashi invented more Jutsu. He invented a light speed fire style, purple lightning that is meant to replace lightning blade and he invented earth styles so powerful they cover entire villages and he can crystallize them to make them stronger. Losing his sharingan actually made his chakra reserves increase, now he has more massive amounts of chakra than he use to (the sharingan drain is so massive even Itachi and shisui would deactivate it just to spar but kakashi never could deactivate it) kakashi still remembers the thousands of Jutsu he copied over the years. He even stated he's stronger than he was during the war arc with one sharingan. And back then he was already fighting Multiple V2 Jinchuriki making him way above sanin level. Not to mention he could match kashin Koji who fought jigen. Kakashi is no joke. Conclusion Kakashi is even stronger with no sharingan than he was during the war with one sharingan. Artwork above by PencilKage