To be honest most come with some vague kind of argument, the issue is that it is all been dealt with pretty strongly before. There's no point getting angry at people wanting to discuss things now though.
To be honest though with 9 days to go it's probably time for me to have a crack at an anti-Ridley post, let's see...
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How much teasing has there really been, and to what extent can we really assume that teasing means playable. Whilst there are strong suggestions on here that the evidence is for him being playable, there really needs to be strong thought put into the potential issues with the arguments. Let's break this down into parts though:
1. The teasing, lack of naming and the timing
Whilst it has been suggested that such "teasing" is indicative of a playable character being hyped up, can we really say for certain we understand the methodology used to "hype" characters. We know all to well over the history of the Smash series that we simply can't predict Sakurai, and when we think we know, we tend not to. In this case we've been given clear hints at the possibility of Ridley being in the game, but with such little time left, and them previous hyping up stage bosses, it's not entirely unreasonable to expect that the style used for Ridley is more suggestive of him being the big ticket stage boss, rather than playable.
Consider the timing, hinting and reveal of other stage bosses. They hinted at Yellow Devil, and showed him both out of context, and not mentioning his role, not to mention the them showing Ultimate Ghost over the course of what seemed like months before finally showing it as a boss of some kind. This does seem to be a feature that Sakurai is proud of, and what better way to hype up the feature than with a character they may well see as the perfect stage boss, on his very own stage (or his clone's really). They did seemingly try and build up hype for Yellow devil in particular was mentioned quite some time before even the concept of stage bosses was revealed. Keeping in mind they didn't name Ultimate Ghost for a long time either, and only recently really clarified exactly what was going on there, it does seem that they want to hype up that feature, and as such hyping up Ridley as a stage boss may make some logic to them. Particularly now that we've got an unnamed Metal Face, only as a shadow and likely as a stage boss, we've got even more parallels to Ridley, and we had plenty as it was.
2. The shadow, what we saw
What did we see though. We can make all kinds of inferences, but for anyone who looked through the ESRB leak thread, we can make all sorts of subtle inferences off pretty much anything, and the whole shadow argument may well just be a bit too convenient.
Starting with his size, he's still not small, in fact the lower range of his size seems to have been gauged at just over Bowser's height, and potentially longer too, and Bowser is an absolute monster in this version. If there is any error in that calculation as well (and as it's based off a shadow where we have limited ability to test shadow effects it is more than possible), then he could be still a bit bigger. I won't go as far as saying "too big", but after some criticised Ridley's size in Brawl (not many, but some did claim they oversized him a bit too much) they may well have made a stage boss that's a bit smaller, more mobile and harder to hit. He may be on the cusp of a playable size, but equally his size also doesn't rule out being a stage boss.
On that point though, consider the shadow. We talk about the jerky movements, we talk about how bosses tend to be on the rail, but consider who we've talking about, and how this would be set up specially for the shadow shoot. They could have made a more agile, threatening Ridley boss, which had similar AI to a playable character, but attributes that would preclude such playability. Add into this the obvious detail they've put into some background elements (notably the hole), and there is the potential for "an enemy from Samus' past to appear at any time" there.
3. Ridley's popularity
The majority of sales come from the West, and they seem to recognise that enough to pay some fan service, but consider where we are in the release cycle. We're in the home stretch for the Japanese release, what they're hiding is for their sake, not ours. Japan still gets preferential treatment, for whatever strange reason, and who here honestly believes that they're saving Ridley for a big reveal for Japan? Would they really care? They're not saving him for our sake either, as they know full well he'll be spoiled for us by the Japan release. They might be saving him for a last day reveal, maybe even for a post release trailer, but why would they? This is about Japan now, they aren't going to go for the "BIG REVEAL" for a character they aren't that interested in. It would be as sad as the Japanese Xbone release.
It's worth pointing out that Ridley was just as popular for Brawl and they made a big ticket boss. With them clearly so excited about these stage bosses, they may well think that's enough to get people hyped for. They might think it's great fan service even, keeping Ridley as a boss, the best damn boss they could make.
Overall you've got to admit, there is a real, a very real chance that Ridley is just their big ticket stage boss, and it fits with how they've revealed the others.
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Whilst I don't really agree with the entirety of that logic, there is certainly an argument to be made. I'm pretty sure he's playable, but you have to show the other side at least some respect and let them have the chance to make their arguments. There's no point belittling people on here for arguing about whether Ridley's in or not in the thread about exactly that.