I doubt even S-E knows what they're doing with the FNC series. They wanted to make three games with a common mythos, fine, but one of them was already renamed (yet retained the mythos) and the other got a bunch of previously unplanned sequels. It's a mess.
Anyway, my point is that the mythos has nothing to do with the number 13. S-E can call Versus whatever they want.
And this is precisely why Squeenix should never be trusted with Compilations.
Besides, Squeenix proved how loathed they can be to discard pre-rendered cutscenes when they inserted that goofy ass scene at the end of the Casino Night Zone in FFXIII-1 let alone even having "Set Color Code to Blackwatch Plaid!" Jhil Naboopalin (or whatever) around given that I just described the sum total of her contributions to the events of the game in this very sentence before getting disposed of like a Red Shirt on Star Trek. And then there's Fang's gender getting stuck in Female because somebody did up a pre-rendered cutscene before Squeenix realized they could ignore Lightning's agency in the story to turn Fang/Vanille into the stealth main couple ala Vaan and Penelo in FFXII (and this is also the reason why there are cutscenes on
Type-0 got away with the conversion because there was hardly anything there to begin with (and the cellphone idea was ludicrously unrealistic to begin with).
But despite all the jokes to the contrary, there have been pre-rendered stuff put on the table over the years (including ties to FFXIII-1). Its just a matter of how awkwardly they're going to shoehorn those scenes into the final game, XVersus or not.