The Lion King

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 source for those theories.

It's true, they can't show 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 said 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 you when you were young."
Simba could've replied...

The Hornbill King 1(THK).
The Cast.
In alphabetical order, with translations of the names where applicable:-

Banzai [Skulk, Lurk]: Most quick-tempered of the crows. Best with
comebacks. Offsets Shenzi and Ed quite well.
Ed: The stupidest crow. Has a Bill the Cat stare.
Noted by warts on the tongue. Too stupid or slow to lie at the
right time.
Kiara: Dege {original Simba}'s and Nala's chick. She completes the Circle.
Mufasa: Current King of the Party Lands. Well-built Great Hornbill. Big beak.
Brown eyes. Father of Dege. Elder brother of Scar.
Nala: Friend and companion of Dege. She can pin Dege in...