I don't think so. And as canon I now mean the sequel movie The Lion King 2: Simba's Pride because it's the main 来源 for those theories.

It's true, they can't 显示 every little detail about crucial plot parts in a film. But what they can do is refer to everything crucial. Like, in this case, if there had been another cub before Kiara, they could've and would've 说 so in the film.

In example, they could've had Simba and Nala briefly discuss it instead of how much Kiara reminds them of Simba. Or, combined the two topics.

Nala: "She's just like 你 when 你 were young."
Simba could've replied...

I know some people think that Scar and Mufasa are not brothers but 你 see they are and I will tell 你 SCAR: Scar has his mother's 毛皮 she has brown 毛皮 and he has his father's mane he has a black mane and also Scar's green eyes come from his father too! MUFASA: Okay and this is Mufasa he has golden 毛皮 like his father and he has red eyes like his mother but the red mane I don't know where that comes from. But here it is this is what I think. Okay, so some people wonder who Scar and Mufasa grandparents are well.. here 你 go Scar and Mufasa grandparents are (DRUMROLL) Mohato and Asali! Now...