kakashi only has MS not EMS and he might have more chakra than Itachi, it guess because he not uchiha that his chakra gets raped alot more when using sharingan compared to itachi having the blood to use it full force
Can we have some evidence please, it's no use making a theory without having proof to back it up, why would anyone believe it without some proof ?? but to answer it I think no for reasons that have already been stated by everyone else.
They aren't going to give Kakashi the ems U_U... Though you guy's are wrong about the sibling thing, it can be transplanted from any other Uchiha, two MS=EMS. Just sayin.