maybe the black lightning just vaporizes what ever it touches and sasuke can only do black chidori in cms
Hmmmm... normal lightning nature jutsu, only numbs the body, this one seems to completely halt it's movement, or not.
Actually, it seems to be capable of moving and dispersing only when it's ordered, like here, the first is thunder roar, that stops the enemies movements:
Then on the next page, on the right top panel, it is still running, until it hits another unit of enemies or hits the ones which it first stopped.
I know what makes Black elemental's different from normal elemental jutsu. It has to do with the Ying Yang ratio similar to a Bijuu bomb and by altering this one can create a more destructive jutsu. Its not something simple just anyone can do as Nature alternation on top of Ying Yang balance is complicated.
Amaterasu and Black lighting are just variations of the same thing as there could also be Black Water, Wind and Earth based jutsu's. Essential someone with fire based chakra and powerful chakra capacity could use a form of Amaterasu but it would involve hand seals as only Uchiha can use it from a dojutsu.
Same way you compare a Rasengan to a Bijuu bomb the basic essentials are the same in the formation of the Chakra but you must add in the Ying Yang balance to add the higher level of destructibility that makes it a Bijuu bomb.
What chakra type are you?
Aha, you say know, please link where it's stated.