This. This right here, is why the American court system is totally fucked up beyond repair. It has basically encoded "size of business" as a deciding factor into the fucking law when determining cases.
That's why big companies like Disney have hundreds of worker bees, farming through all original properties they can find. Than they cherry-pick the most promising ideas, and completely rip them off. There is barely an "original" Disney property coming out in the last decades that was not a direct rip-off from a much lesser known, independant property.
Then the suing party has to "prove" how certain writers had seen their tiny property - virtually impossible. Only for YEARS LATER, the actual writers coming clear - yeah, of course they knew about "the white lion" when they were writing their "Lion King". But fuck them trying to prove that back then. It's impossible.
An actual fair justice system would rule on the content itself - the idea as it is depicted in media - is the change of a Tardigrade to human-size, added blue colors and blue sparkles, serving as a weird FTL-drive - is the realization of that unique enough to warrant "first dips" or not? That should be the real question.
Using your example of
Kimba the White Lion (which never went to a lawsuit, despite several protests in Japan and encouragement for the animation company to do so) to illustrate the difference between it and the
Tardigrades lawsuit:
Kimba was widely played throughout North America beginning in 1966, 28 years before
The Lion King came out, giving it ample time to be seen by a large audience here, including the Disney writers.
The co-director of
The Lion King, Roger Allers, lived in Japan in the 80s and worked in animation at the time that a remake of
Kimba was being broadcast there.
Osamu Tezuka, the creator of the
Jungle Emperor Leo manga which
Kimba was based on, met Walt Disney in 1964 and Disney expressed a desire to make something similar in theme to his
Astro Boy.
Two of the animators of
The Lion King said that they had seen
Kimba growing up in the 60s, and had assumed many of the other animators had as well given its popularity.
Matthew Broderick, when he got hired to do voicework for the film, actually initially thought he was being hired to do a Disney remake of
Kimba the White Lion and that they had just told him the wrong name for his character (Simba instead of Kimba).
Disney put out a early animated promotional video for the film where the lion cub actually was white like Kimba was.
Both stories centered on the theme of "the circle of life". Both stories featured Kimba/Simba looking up to the clouds in the shape of his father. Both stories featured an evil lion named Scar. Those are direct thematic, visual, and name elements.
Both stories also featured a wise baboon, a funny bird, and a pair/trio of laughing hyenas, though some of that can possibly be chalked up to the African setting.
So in addition to having more and clearer connections to the alleged source material than
Discovery does to
Tardigrades, there was ample time, opportunity, and exposure for people working on
The Lion King to see
Kimba the White Lion, while that's harder to demonstrate for the barely public
Tardigrades which didn't have much time or widespread exposure before
Discovery started production.
There's also the fact (mentioned here numerous times) that spacefaring tardigrades were in the zeitgeist at the time both
Tardigrades and
Discovery were being made because of the news announcement of them being extremophiles that could survive in space and being featured on the rebooted
Cosmos.
If
Tardigrades had all of the above going for it in addition to the few thematic and visual similarities, then that would be grounds to continue the court case, because the animators and possibly the director in the hypothetical Kimba vs. Simba case would have said under oath that they were familiar with the previous film.
Tardigrades doesn't, so they have to essentially shit or get off the pot and prove they have grounds for the case to continue. That's how the courts are supposed to work.