-the pattern is clear, and almost entirely consistent. You can argue that the other side is a different pattern, but how realistic is that really? That would imply it's pure coincidence that so many characters fell perfectly in blog order on the visible side. It's possible, but it's also technically possible that Ridley will be cut from Smash because Sakurai changed his mind again.
- the pattern breaks in exactly one spot, which suggests an echo, most likely Ken. This also lines up really nicely with both Verg, who has a track record, and the Ken image leak that last I saw was widely agreed to be real. If we get any confirmation of Ken, that's a prediction box theory made that came true. Really, there aren't many possibilities here, even with the minimum assumption of the unshown characters are on the other side. We have (1) Ken is there suggesting artist knows roster, (2) artist only layed out one side and miscounted on the pattern they were going for, (3) there's a blank spot on the other side for seemingly no reason, (4) the pattern one the visible side is coincidence, which is statistically impossible (which is not the same as actually impossible)
-the bottom row of the visible side is not centered. This creates ugly asymmetry. It's also worth noting that Smash in particular has a fondness for keeping things centered as
Shroob
has pointing out repeatedly in unrelated debates.
-marketing departments often know secrets of a game early, even before the programmers at the same company, even on the same game. This isn't speculation. I work in game industry. Im going off a combination of my experience and being told by other workers in the industry.