i don't agree that kakashi without sharingan is stronger than gai but i agree that considering current ms kakashi and gai are in the same level because just they are rivals is unfair
we should compare between their powers
for example
kakashi has kamui and use it well now ,he used it before kuarma chkara 6 times with 6 raiki,2 light chain,shadow clones,earth jutus,sharingan all time
in the other hand ,gai has hiudora and he can use it one time only in a fight
note

ne kamui >>one hiudora (can you compare more than 6 kamui with one hiudura??!!)
i think the difference is so clear