Re: Ignis being blinded, that was obviously decided prior to Episode Duscae, since one of the King's Swordsworn in the prophecy painting had a bandage over his eyes. No inside info is needed to suss out that that had nothing to do with DLC.
Re: Noct needing to find the other party members in the World of Ruin, that seems plausible, but it also seems like the sort of thing that would have had to change before significant work was done on it, since there's no reason why, say, older character models couldn't have been relocated to Hammerhead instead of going to waste. There's no excuse for Cindy not being at Hammerhead; Talcott even says she's supposed to be there!
Re: Versus, I'd be inclined to think this was complete bunk even if the guy who said it had other claims confirmed, because it just doesn't make a whole lot of sense and sounds like it was made up by someone who was trying to put as much FNC influence in it as possible while feigning ignorance as to many of the known details of the FNC mythos. And, seriously, calling the afterlife
Versus? Nomura can come up with some... unique terminology, but that doesn't really feel like his style.
Re: Cindy in particular, if her post-timeskip design was meant to be an answer to the game's female representation problem, there was even less reason why repurposing her appearance wouldn't be prioritized (especially given how trivial it should have been to do).
Re: Stella, her appearing only to Noct doesn't make any sense in light of Ferrari's description of Gentiana as being "Stella's messenger and a point of contact between Niflheim and Tenebrae" and "a bit like Lady Oscar for her Marie Antoinette (Stella), always by her side, of few words, but with a gentle and conforting smile." The "leaker" tries to fix this in his description of Gentiana, but it doesn't really work -- if Stella's only role was to be a ghostly guide for Noct, none of what Ferrari described would be necessary.
Re: the supposed opening, the scene described is plausible. Too plausible, in fact, for the explanation of its removal to hold any water. I mean, the
two line description makes perfect sense. Why in the world would the team think that an actual scene in which Bahamut referenced Noct's destiny not make sense? (It's worth pointing out, though, that the "leaker" seems to have forgotten the actual content of the Dawn trailer, because it was the Lucii (rather than Bahamut) that were present when Regis learned of Noct's fate in that trailer.
Re: the dogs, I'm not even sure what the "leaker" is trying to get across. Umbra was a party member but stopped being able to transform into a human after his removal from the party? But they added more dogs who could turn into humans, including Pryna, except that was cut too? Huh?
Re: the car and chocobos, no duh?
Re: Luna and endgame alterations, how would her role possibly have been affected by the World of Ruin being shrunk? She never spoke posthumously.
Re: Ardyn, that sounds absolutely awful. Royal arms are a complete pain to use for more than an attack or two at a time due to the health drain, so having up to
thirteen separate sections of a fight against Ardyn's final form where you can't use weapons other than royal arms and the ring (which probably would be limited to Holy in a final boss fight, since the other moves are one-hit kills) sounds like the opposite of a good time. It'd be pretty bizarre on a narrative level, too, since the compassionate send-off Noct gave Ardyn requires Ardyn to look like a dying human being instead of a monster.
And, no, the Lucis crest isn't evidence of the supposed appearance of Ardyn's monster form, because it makes literally zero sense for the usurper who took Ardyn's name because Ardyn was corrupted to take as a symbol an image of a monstrous Ardyn, the heck. On the other hand, it's pretty easy to look at that crest and see the potential it offers for crafting a plausible-sounding final boss design. =P