I missed this.I just noticed something that might be another point in Team Real's favor.
Take a look at Samus on the leaked select screen. Note the proportions of her helmet and visor.
Pretty much every roster prediction/hoax image I've seen uses Samus' render from the official site. It makes sense that you'd use that image since it's already cut out. However, for whatever reason, the render is a little too wide. On the other hand, the mobile version of the site contains an accurate render that's a bit narrower. If the select screen was fake, the person creating it would have had to make this obscure connection. It's not impossible -- after all, I noticed it -- but it's yet another small detail that the leak got right. It's not exactly common knowledge that there are two Samus renders.
Just thought I should add that there is an already cut out high res version of the Samus art available in the press packs which I'm sure any Smash Bros enthusiast knows how to get.