Okay, so you mention that there's a litany of evidence that the Lion King is based on Kimba the White Lion which looks remarkably similar to Leo the Lion, King of the Jungle from the 1980s. Given that Kimba came out in 1966 I'm guessing that Leo was probably a renaming of newer seasons of the older show.
Still, when you mention "litany of evidence" I would like to at least see some evidence other than the obvious: both have young cartoon lions, take place in Africa, are coming of age stories, and have similar names e.g "Kimba" and "Simba". It also depends on whether we're still talking animation style or story structure. The Lion King's story most closely resembles Hamlet, which has been admitted to by its creators. Being an Anime, Kimba's plot is more likely to be episodic in nature and seems for the most part to focus on mending the relationships between humans and animals. A young cub born in captivity returns to the wild to find his place and fight for good, justice, and peace like his father.
I'm just saying that if you're going to make a blanket statement like that it would be nice to include more details other than "Simba" and "Kimba", and one coming before the other. After all no one is going to debate how Western and Eastern animation have influenced each other over the years, it's just a matter of when and how.