Do you realise how stupid is that
Brat kakashi make chidori
Sasuke learn It in one month
Current Rock lee who dedicated his whole life to taijutsu can only open 6 of them.
Might Dai spent 20 years to be able to open all of them.
your post failed.
Your an idiot
The evening elephant is a series of taijustu moves only someone who has mastered taijustu could ever perform an A rank taijustu move.
On top of that that can only be done once you unlock all eight gates which is in itself a A rank
And it can't be S rank in a sense because once you can open the gates there is no way of one being able to open all eight gates better than another person at that point it all depends on how much power one person has overall.
Which leads back to the comment you tried to put down as false.
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The data book does not use a-b-c logic
Not too mention anyone who can master taijustu or ninjustu don't go on to master the other its a completely different practice so its not like someone like naruto who can perform A and S rank justu can perform the eight gates or evening elephant.
The reasons they fall under their each respective ranks is for completely different reasons.