If I had to hazard a guess
I see what you did there
In all seriousness, the arguments about Ridley are rather pointless. Sakurai is intentionally dangling the carrot, so to speak. He wants people to think about what he has shown to everybody.
The only evidence we have is a shadow on the ground, which is clearly Ridley. Detractors say that he appeared without a playable status, and he is deconfirmed. Supporters say that he didn't actually appear (which he didn't) among other reasons, so we are all interpreting the evidence in a different manner, which is just human nature. Sure, Ridley supporters are going to try to put a positive spin on things, but I don't really blame them because the evidence is not concrete. Ridley detractors are quick to jump to his exclusion because, well, that's what they saw. I myself don't really know what to expect, and am staying neutral towards him because at this point its all up in the air. I think that it is important not to jump to conclusions, because we don't really know what's going to happen (like with Toon Link.)
Sakurai has continuously teased his appearance (playable or not) and he is aware that people have been requesting him. Whether it be the direct, his comments about Ridley being a little slow, or the comment attached to the Pyrosphere stage, he is infamous for doing things like this. He will make you think a certain way (again, like with Toon Link) and then turn around and do the opposite. He does it well, he truly is a good hype generator. Point is, we can't 100% say whether is playable or not, but one thing is for certain, and I believe everyone will agree, is that he is in the game in some shape or form.
Let's leave the interpretation of the evidence to places like Rate their Chances because this topic has been going on far too long and it's clear that both sides will not yield to the other.