I've actually since severely taken back what I said in that post lol. The whole "Captain Falcon with a sword" thing is not really true at all, if one is playing Roy better. I think Roy is top 20 still (probably not top 15, but potentially so) though. Allow me to expand.
Captain Falcon's style is based more around reads and baiting your opponent into doing something punishable using his overwhelming speed and dash grab. He uses other tools like bair and up air to help, but that's his gameplan for the most part. Weave around your opponent till you get your chance.
Now, the way I see it, optimal Roy play is nothing like that. Roy is a character that slowly moves up into his maximum range and likes to keep it there, using spaced out nairs, fairs, jabs, dtilts and ftilts to harry your opponent, and keep pushing them. All of these moves are quite safe when used properly, giving Roy a significantly more difficult to guess neutral than Captain Falcon. Captain Falcon doesn't want to sit around in neutral: his opponents know what he wants to go for and he just has to get it. Roy's neutral is much more difficult to pull apart. He has much more varied confirms than Captain Falcon, and has a much easier time applying constant pressure. Roy likes to grab like Falcon, but his grab isn't nearly as fast and so he has to be more careful about when he goes for it. Captain Falcon's best kill setups all start from his up air and throws, so he fishes for these quite hard, while Roy's kill setups tend to come from his sour aerials, his jabs, or his low-hitting moves like dtilt, which setup for a read to kill with blazer/tilts etc.
Honestly, the only thing Roy and Captain Falcon have in common is that they both have a good grab game and they both have good punish games. But you can say that about many characters, that's like saying "Sheik is Captain Falcon with a projectiles" or something like that. Not sure why I ever thought that in the first place lol.