So let's avoid getting off topic here. I don't like arguing with fools, so I'll sum up everything in this post. After that, you can rant in the shower alone if you'd like.
I did read those articles, but you clearly don't care. I guess that's what you have to expect from someone who refuses to see the other argument.
Claiming Sakurai was biased is one of my most hated arguments. There is no proof, evidence, or sliver of a reason to believe he was. Find me evidence that undeniably suggests Sakurai was totally biased in the story writing of SSE, first of all. Then, find me evidence that undeniably suggests that Sakurai was biased in the creation of World of Light, which barely has a story to begin with (fun fact: the opening cutscene is the only one Kirby appears in. Other characters are the focus of the rest).
Then, explain to me your binary caveman logic. "Me think Sakurai biased. Y? 'Cuz Kirby is hero." Here's what I see. If Kirby is the hero, Sakurai was biased: no question about it. Nope, undeniable, totally logical. We're just going to ignore the important roles every other fighter had in SSE and focus on Kirby. Pit saving the day to help the Mario and Kirby after the first bomb goes off? Never happened. Ness sacrificing his life to save Lucas? Who cares? Snake offering critical help toward the rescuing of the Halberd? Whatever. Samus saving Pikachu from torture? What the hell. Link and Mario going toe to toe after a misunderstanding of princesses? Bah, humbug. Fox and Falco saving Diddy Kong from Rayquaza and joining the effort? Irrelevant. Captain Falcon rescuing Olimar and single handedly taking down a giant R.O.B.? Bleh. R.O.B. being arguably the most important character in the story by becoming the Ancient Minister and then betraying its master? Nope. The story focused on Kirby characters at one point, therefore, Sakurai was biased in his decision making.
I've given you every piece of evidence you asked for. You refuse to recognize it because you can't accept that the other argument is logical. Kirby can survive Galeem's beams by traveling faster than light. That is also fact. So can Sonic. And Samus. And Mario. And probably at least half a dozen other characters in the game. Hell, Palutena and Bayonetta could survive by merely existing. So the devs had to narrow things down. Somehow, they decided that Kirby, Palutena, and Bayonetta were the only ones capable of not being engulfed by Galeem's attack. This meant that in some way, each of these characters needed a way to be able to travel or escape in the ten seconds they had, and accelerate past the speed of light within another thirty seconds. Sonic and Mario had no means of escaping the planet on foot. Samus' ship was nowhere near, and unseen in the cutscene. Captain Falcon tried to use the Blue Falcon to escape, but it took him too long to get in the vehicle--let's assume the same scenario would have been upon Samus as well. And, as evidenced by Falco, he didn't have enough time to accelerate to a speed fast enough to escape. The whole attack took place in seconds. Even the Pits were helpless to avoid the attack. However, Kirby can summon a warp star at will, that is fact. And we know it can accelerate to the speed of light in seconds, that is also fact. So it is reasonable that he could escape the beams faster than anyone else.
Another fun fact: Just before the attack, Shulk has a vision and sees the attack, and then turns around to warn someone who's eye level is apparently around the same height as most people's knees. This is probably Kirby. In other words, he probably warned Kirby of the attack, knowing that A). He was the only one capable of escaping in the small amount of time the attack took place, and B) he was the only one strong enough to defeat the spirits, bosses, and recuse the fighters.
Outside of story, from a gameplay perspective, the devs wanted the survivor to be easy to play so everyone would have an easy footing form the beginning. Ultimate was one of the Switch's crown jewels, so many new players would be coming to World of Light. They needed an easy enough fighter to let people toy around with in the beginning. Mario is easy to pick up, but there's no way he could have escaped the attack. Sonic and Captain falcon have very limited movement options and require a lot of focus, so they wouldn't have been the best choices to hand to a brand new player. A zoner like Samus would also be more complicated for new players, and they'd probably be tempted to spam projectiles up until a difficult spirit comes in there way and they don't know what to do. Kirby however, is arguably one of the easiest characters to pick up. He's simple and doesn't require months of learning to master. I'd bet a lot of money that's the reason why they toned down so many of Kirby's moveset (R.I.P. Smash 4 dash attack): to make him simpler for newer players.
But it doesn't matter why or how they chose Kirby to be the only survivor. There is still zero, zip, nada physical evidence that Sakurai was biased in his decision making. He explained why Kirby survived and you're just going to have to accept that. So what if he owns Kirby? He's never been biased toward the series before, why now? Mario has the most fighters, is he biased toward Mario? Fire Emblem got a lot of leg room recently, is he biased toward FE? Pokemon has so much representation in the game, is he biased toward Pokemon? Zelda and Castlevania got huge portions of World of Light devoted toward them, is he biased toward Zelda and Castlevania? Joker got a ton of extra features in his contruction, is he biased toward Persona 5? Considering how narrow the representation of Kirby content is in Smash, I'd say it's more likely he's biased
against the series, not toward it. Besides, he left HAL sixteen years ago, before SSE was even a thing, out of frustration. He has had little to no input in the Kirby series since then.
Your proposition that he was biased when Kirby was named the survivor is pure speculation. You know nothing as a fact. There is zero reason to believe that any bias at all was made when the story was written--not that there was much of a story at all. And so what if he was biased (even though he clearly wasn't)? Who cares? What are you going to do, sue him in court? Protest in the streets? Demonize him or insult him? Nobody except you on this forum I have seen has a problem with the story writing. It's literally just character placement in a video game get over it.
But wait....
@Crystanium has the power to read minds!? Whoah! Let's defenestrate logic--they clearly know that Sakurai was biased when Kirby was made the survivor. How do they know? A mystery it is! But clearly, without any evidence, logic, proof, or reasoning, they absolutely, unquestionably, undeniably know that Sakurai is a biased man who cares nothing except promoting a franchise he left out of frustration sixteen years ago! O great humble mind reader, please, bestow upon to me your power of reading minds so I too can point out people on internet fanbase forums and call them biased liars!
Eh, you know what they say. Never argue with a fool: They will drag you all the way down to their level and beat you with their stupidity. I guess this whole argument has been a waste of time anyway, friend.