The chidori/raikiri is based on an ancient japanese tale
The tale involves a man who had a sword called chidori
Then one day he cut a lightning bolt with the chidori sword and renamed it raikiri
Or lightning cutter
Hence the jutsu he didnt actually cut a lightning bolt that would be impossibile
if kakashi didn't cut the lighting with chidori he woulnd't change its name by raikiri.
it's clearly stated by gai that kakashi cut the lighting bolt.
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Sasuke's completed susano can tank kirin.. raikage can't ,
The validity of kakashi cutting a lightning bolt is unconfirmed... And unrealistic.. lightning comes down in 1/10000th of a second, not only that but how did he know it was going to strike him? and have time to make chidori and lift his hand? impossible cant be all done in less than a second.. he can barely move his hand in 1 full second....
Unless someone used a jutsu that casted a lightning bolt, sort of like darui storm release, impossible
i doubt that the full raikage's shield can't take it .furthermore susanoo would not let pass his lighting chakra to control lightings,he'd have to disable susanoo for it.if lighting chakra can go from inside,then it can from outside too ,it's not possible since susanoo block anything.
a fact says that kakashi has cut lighting bolt.you have to use logic to find how he did it and not saying it's impossible.
it's comfirmed by gai ,and your 1/10000th second is comfirmed by zetsu ,why you accept one and not the other?
as i said the only way for kakashi to cut lighting was to be enough fast or to control the lighting bolt after that the storm condition are naturally there .there are not other options possible.
the only reason that's it was possible imo ,was that he can control lightings to cut it from under and not from the side .