Fun fact: dunno if you knew this or not, but Sora's whole design is based off of Mickey Mouse.
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Guess Riku will have to be the DLC instead of Sora, since we have to remove Disney content to make it happen. You heard it here folks: Sora can't get in because his design is based off Mickey Mouse, which is Disney content and we can't have Disney content in Smash.
Sarcasm and exposing stupidity aside, we've already had Disney content in Smash back in Brawl with the Chronicle which mention both Mickey and Donald by name, so getting only the video-game-version of Disney characters really wouldn't be that hard. Just have a spirit of Mage Donald, Knight Goofy and apprentice/KH3 Mickey and your done.
Also, are you guys SERIOUSLY suggesting that Smash would have to edit the keychain of the default and most iconic Keyblade in the series? You DO know that in all other crossover media Sora has been in keeps that mickey keychain, right?
Not counting the Tsum-Tsum crossovers because Disney owns them, both his KH1 and KH3 designs in Brave Exvius have the normal keychain as well as his appearance in World of Final Fantasy. I think he's appeared in one other crossover but I may be imagining things.
Even if we got no Disney content OTHER than Sora (who is a fully Disney-owned character designed by Square) part of his iconic design is the Kingdom Key, and they wouldn't edit that in any way. In edition, this argument about Disney content is dumb because Disney owns ALL the KH unique characters, not just Disney character that existed before KH. This means Sora, Kairi, Roxas, Ventas, Xehanort and many MANY more are all Disney characters, and by your logic they couldn't happen if you had to remove Disney content.
So no, either Sora comes with Disney content because he IS Disney content and so is everything tied to him that isn't Final Fantasy, or he doesn't get in at all. No one ever argues this kinda of weird editing and censorship for any other character but for him and it's weird.
Besides, the only credible information we have about him is that Imran Khan suggests Disney Japan already said no and that Shinji Hashimoto himself said there were no plans for Sora in regards to Smash in mid-2019 which is about the time most of us think negotiations for more characters happened. As much as I used to love KH, it really doesn't look good for the lad, and that really doesn't have much to do with his Disney content.