I wouldn't call Sora and others just normal people, because if that is the case, why didn't the keyblade just choose that random fat guy in Traverse Town in KH1? I mean, they all have something special about them, whether it be their connections to others (Sora) their hearts of pure light (Kairi), etc.
Okay, first of all, let me clear this up: I never said normal people, because Yen Sid and Merlin are not normal people. Merlin is, I don't know, the most well known and legendary wizard of all time. Yen Sid is practically the animated alter ego of Walt freaking Disney himself.
Now then, just because you are chosen by a keyblade (which Sora was not, so we can cross him out) does not make you strong. Special maybe, but not strong especially compared to people who have spent most, if not all of their lives training with the keyblade and/or magic (Terra, Aqua, Ven, Yen Sid, Merlin.). In fact Sora and Riku never had time to train because they were too busy just saving the world. Im surprised Yen Sid saw them fit to take the mark of mastery exam already. Mark my words, Yen Sid and Merlin are stronger than Sora and Riku. They're just island boys who one day found a magic "sword" and learned they could do basic magic. If it weren't for them being the playable protagonists of the series, then almost anyone aside from some Disney villains could mop the floor with them.
Also, yes, even at such an old age, Merlin and Yensid could conjure up powerful magic, but now you are just making up spells for the sake of your argument (anything the series has yet to see)??? If the series has yet to see it, maybe it doesn't exist!!!! You also are saying they could make speed boosters? Well, if they could, why didn't they? Do you think Merlin wants to stay slow and have a pot belly for fun? NO!!! That's just plain stupid. You are making up spells now in order to prove their strength, but those spells don't exist which is why they haven't been used yet.
Wow, don't get so mad man
Somebody earlier in this thread told me when I was poking fun at how Stopza seemed like a completely made up spell, that KH is it's own series, thus it can have its own different set of spells. So do not say that I am making up stuff for the sake of my own argument or this discussion is going to get very ugly, mkay? A speed boosting spell is very plausible considering that every single final boss in this game was zipping around the rooms. So how do they do that? Oh, I guess we're going to be fed the same unoriginal garbage that "darkness is evil and it makes peoples' bodies inhumanly strong and fast", lol. Plus flowmotion as well.