^
I agree with that. Kion looks a lot like Fluffy - both of them have golden fur that's only a few shades lighter then Simba's, as well as brown ear-rims, while Simba's were darker. And the presentation of the cub is different from Kiara's.
I know Disney stated a few times that Fluffy is, in fact, Kiara, but that was ages ago, before Kion was a thing. I'm pretty sure if we asked them now regarding the issue of the cub, they would just say Fluffy is Kion.
But, yeah, Kiara is the oldest.
Still, if someone wants to think it's Kopa, and try to somehow fit the little guy in, that's cool too. It isn't Disney's idea, and it doesn't make much sense time-wise, but as someone said, it's still a fun theory in the end. I don't believe we should be discussing this all that seriously, it's just an animated movie and it should be enjoyed.
I just thought of this theory. Please don't kill me for posting here, it's kinda related... Here:
Simba and Nala have Kopa first, and events of 6NA take place. He is still very young here, which explains his bratty behavior and, well... he's kinda stupid in the books too, ism,t he? Nala is pregnant during this period, but she and Simba want this to be a surprise for their son. Tough luck though, as Kopa dies at Zira's claws (or does he?), forcing bitter Simba to kick her out. Nala, traumatized, delivers her cubs prematurely, and that's Kion and Kiara. The pair is heart-broken because of their lost son, but don't have time to deal with that properly as they need to be strong for their new cubs. Kion is born first, and Simba and Nala want him to rule, but Rafiki informs them that he's going to be the lion guard and have a different role protecting the circle of life. Now, the two are paranoid, because they think Kion might be jealous if his younger sister becomes the queen over him, despite him being the next in line. They decide to pretend Kiara is the oldest, to their great pain. It's for the best, because, at the same time, they don't want to make their hateful towards anyone, not even Zira. The two grow, and Simba has a hard time bonding with Kion, because he sees a lot of Kopa in him - Kopa looked similar, befriended a lot of other animals... However, eventually Kion hears about Kopa, either from Mufasa, or some animal... I dunno. Kion is hurt because nobody ever told him about his brother, and runs away after an argument with Simba, where I guess he tells him he's nothing like Mufasa.
He walks around aimlessly until, much later, he stumbled into a scarred lion who looks identical to their father. That's Kopa, but he's different. The lovable cub he once was is now dead, and because of Zira, Kopa is a paranoid wreck, who shudders at the very thought of going back. They live together, and once they do go back, they get to see their sister getting married to the son of the lioness who tore apart their family. What will the brothers do? And who will become the new king?
Ok I need a hobby or two.