The thing is the first point is argued quite a lot in Naruto's fandom. Since Sasuke using Kirin was considered a big deal, and early Shippuden Naruto and Sakura should scale to Kid Kakashi.
Kirin is a huge deal because most Ninjas on Itachi's tier can't even deal with it at all in terms of getting out of the way, that's why it's stupid that people are taking the "Kakashi cutting Lightning" thing so seriously.
Why would Kirin be considered lethal against them if they are Lightning Speed and Kirin is made purely of Lightning? Furthermore, people also argued that the lightning Kakashi cuts may not be on the level of actual Lightning speed. It was weird reading this, although since this isnt in Naruto fandom they may not know this happens.
I mean, even if we say that's the case(And there is some merit to it as Kirin is the only Lightning Jutsu given the actual moniker of it moving at the speed of Lightning), I don't see how that does anything to Dark Sakura? Gilgamesh tore her to shreds and she regenerated all of that damage in seconds, hell, Sakura will probably attack her body where her Shadow is and just gets eaten from there. People put too much stock into speed and nothing else as like me and others stated before, what chance DOES Sakura have at victory? And the answer is none.