I'm back
Let's consider the arguments being made here and why they're not only fallacious but simply just contradictory of how we do things here
" First of all, age doesn't necessarily equal knowledge."
I agree but what's the point of this exactly? are you really purporting that Zetsu is incapable of knowing simple knowledge such as how fast Lighting is? I guess Yama's heat isn't 15 million degrees because he doesn't know how hot the sun is and he's not a reliable source just because he's old, this is a pretty poor argument to make as it doesn't debunk the statement any more than it supports it.
"Black Zetsu is a renowned liar"
Ahh, here's our first fallacy, the association fallacy "Black zetsu lied to Madara about being on his side so Black zetsu is lying to the audience about how fast Lightning is" despite the fact that Lying about Lightning's speed doesn't serve him any purpose nor advantage, whereas when he did lie he lied to further his plans, so this argument falls apart in an instant if you even consider the absurdity of it.
" he isn't a scientific source"
Buddy, you'll find 99% of fictional statements DON'T come from scientific sources, this literally means nothing, none of us here are scientific sources but still know the speed of lightning and are able to tell you.
"There's no reason that lightning in the Narutoverse should be any faster than lightning in the real world"
Of course, except it is because Kishimoto says it is, he sets out how fast Lightning is in his own verse and we go by that, this seems like an argument from disbelief fallacy, there is a reason it's faster, Zetsu's statement.
"The statement itself is wrong. It says the speed of lightning is a timeframe, 1/1000th of a second, which isn't a speed."
Before i even begin, is this a serious argument? These are getting more absurd by the second, Zetsu's saying it's not possible to dodge it because the speed is 1/1000 of a second, what would he be referring to when he's specifically talking about how undodgeable it is? It's obviously a reference to how fast it hits the ground since that's the speed that would be relevant to dodging or avoiding it.
" We can provide any distance that falls in the range of cumulonimbus clouds, but they're just safe guesses."
I agree, which is why i've always said we should use an average of all the distances of the cloud as the distance.
" His surrounding information is incorrect as well. He stated nobody could evade it, but Itachi did (in the worst of conditions at that), therefore people like Madara, Hashirama, Pain, etc. could."
Are you really incapable of sorting hyperbole out from the actual factual not contradicted information? Being wrong about one thing doesn't automatically mean you're wrong about the whole thing, i guess we better throw out Einstein's entire books and theories since being wrong about a few things means he's wrong about everything, it being undodgeable is contradicted, it reaching the ground in 1/1000th of a second ISN'T, that's why one is hyperbole and the other isn't.
". It adds confusion to the story when you remember Kakashi's raikiri got its nickname when he cut lightning with the jutsu."
You didn't explain what you mean by "confusion" so i'm not even sure what this point means, but i'll assume you mean scaling wise, it really wouldn't, Kakashi by then was already a well renowned Jounin with a sharingan and skill far above his age, we have new gen characters are several thousand mach so this again is just wrong.
"We use that value for one feat, Kirin. We systematically use our wiki's lightning values for every other lightning calculation."
Well you're right for only the second time, there should be an argument made for Lightning speed in Naruto to be changed based on the information given to us in the series.
"I haven't found anything that alludes to natural energy making a technique "more real"."
It's not a "misconception" and natural energy alone doesn't make anything instantly real, it's just more support towards it, like Light fang for example, if it was only made of natural energy and thats all we knew it wouldn't be enough to support it being natural light, but with the other information we have it's extra support.
In conclusion the entire premise of this argument is based on fallacious points you could apply to every single series in this wiki and it would look pretty dumb to, literally all your points boils down to either "Zetsu lied to Madara so he's unreliable" or you simply not wanting to believe it's that fast.