I could have sworn I read that FFXIII and Versus were supposed to be in the same universe at least. This was back when they were announced though. If the crystal theme is all they have in common, then I think they may as well have named it FFXV. FFXII had crystals, and the logo for FFIX was a crystal. It's not really "going back" if they barely left it at all

Oh well. The title is the least of my concerns.