"(S)imba and the other called (K)imba"

Kimba is a localised name. His name is Leo in the original work, which is titled 'Jungle Emperor'. Simba literally means 'lion' in Swahili, which is consistent with all the names in The Lion King.

"both characters have a talking bird as sidekicks"

Zazu isn't a sidekick. He's more like a royal guide/caretaker. Other than being birds and having a similarity with tempers (though nowhere to the same degree), they have nothing in common.

"both had their father killed when they were cubs"

Oh, and did Simba also have several scenes where he dragged his dead father's corpse around?

"both of them talked to their dead father in a vision on the clouds"

Yeah, that's not even close to true. Kimba not only didn't talk to the cloud, but the cloud was actually Kimba at the end of the series, after he *spoiler alert* dies.

"And both shows feature a black haired lion with a scar in its left eye as a villain (with a group of hyenas as henchmen)"

Outside of being very common tropes, the lion and hyenas in Kimba are not only not the primary antagonists, they only actually show up in a handful of episodes (out of hundreds). So unimportant, they weren't even included in the compilation movies for the series.

I'm not gonna watch the video you're sharing, but I'd venture to guess at least 90% of the footage it shows, is from the Jungle King Leo movie which released 3 years AFTER The Lion King, and all the comparitive shots from that movie were never in the Kimba source material.

Even if some of it was inspired by Kimba, they'd have no reason to lie about it as the similarities are very superficial at best. Not including the more similar shots from the 1997 movie of Kimba, 3 years after The Lion King.
And if you're gonna point out superficial similarities, then there's basically nothing in the continent of Africa Disney could've used, that wasn't in one of Kimba's random episodes. Which is when it falls into the 'Simpsons did it' dilemma.

Go watch the YMS video that was already shared in this thread. It's two and a half hours, but it's a lot shorter than having to watch all of Kimba, and is far more well sourced and comprehensive than anything else on youtube.

If you can't be bothered to do that, then don't waste people's time by repeating these fallacies.

So I assule you also think Hunger Games has absolutely nothing to do with Battle Royale then

Well... I actually explained why it's invalid... if you actually had a response, then I'd be open to changing my position.  That's the purpose of discussion.  But if your only response is "nuh-uh" then yeah, it's pointless.

No, you explained why YOU feel it's invalid. I already explained the similarities that I find suspicious; you already gave me your reasons why you feel those similarities are not a valid evidence, and I already said that I disagree with the reasons you presented. So really, what else there is to say? 

All discussions don´t need to end with one party changing the other´s mind; like you said, we don´t have access to the creators minds so there is no way to know the actual truth. So yeah, this is all pointless in the end.

All discussions don't have to end with one party changing the other's mind, but they should start with both people being open to that possibility.

"Coincidence never happens a third time."
-Osamu Tezuka
Creator of Astro Boy, Kima the White Lion

'Kimba was created in 1950, and animated in 1965. Simba: King of Beasts came out in 1940.'

Bolded: Please do not take that quote as wisdom as it is a rather stupid saying.

Coincidences happen all the time,constantly.

Yeah indeed, or just disagreeing and be alright with it.

If you dramatize others to the extreme of being villainous for just having a different opinion than you have then it might be more fruitfull to look into yourselves for why you  think so drastically about your opponents/those you're disagreeing with.