Vanitas is a real heart. Whose comparing him to a fake one?
Ven's heart went to sleep because Ven literally destroyed half of it. If the connection to Sora wasn't broken, it was changed by destroying Vanitas. (But it wasn't) Because Sora's heart filled the gap where Vanitas' heart went, Vanitas looked like Sora. That's how Ven was able to even BE in BBS.
Remember the beginning? There wasn't a connection originally and when Sora connected to Ven, Ven got up. And then Ven destroyed Vanitas. Which sent him all comatose. Vanitas was never in Ventus' heat, Sora was. And if the connection never broke, then Ven wouldn't have gone comatose when he killed himself. (see what I did there?) Instead of reconnecting [Oh, I get it now] his heat to Sora's, he just safey went inside him.
When Sora returns Ven's heart, Ven will still be comatose. The only way to reawaken Ven is to reconnect the way they did before or complete Ven's heart. With Vanitas gone, the darkness has to come from somewhere and Sora would be the only one able to do it right there.
As far as I saw no one doubted that.
The topic was "new hearts being born", it wasn't which "type" of heart is "better".
Ven's heart went to sleep because he destroyed his
whole heart by destroying the X-blade, which was exactly what Vanitas warned him about beforehand. Destroy the X-blade and your heart will vanish because it is now part of the weapon as well after the forced fusion.
The only reason Ven's heart (and Vanitas's, for that matter) wasn't completely destroyed was because the X-blade was incomplete to begin with.
The connection to Sora was neither changed nor broken because it wasn't even affected. The injuries inflicted on the heart were just too much for the connection alone to sustain it anymore.
Of course Vanitas was in Ventus's heart, the whole final battle between them when we had the split Awakening platform. Vanitas tried to enslave Ven and fuse their hearts together into one, which Ven resisted, making the X-blade incomplete on the inner key, which was also confirmed by Vanitas ("Our union was not finished.").
Ven would have gone comatose nonetheless because the damage to his heart caused by the X-blade's destruction was several magnitudes stronger than Vanitas being cut out of him four years earlier.
That can't work because if there wasn't a connection anymore Sora would not have been able to feel Ven's pain and sadness that intensely and reach out to him, nor would Ven's wounded heart have found its way into Sora's heart.
Only when Sora would return Ven's heart without healing it beforehand such a thing would happen, which I highly doubt would be done by Sora anyways.
And healing his heart doesn't have to mean using darkness. As far as we know darkness
can't even heal.
isnt he just a part of one?
He
started as a part, or rather, at the core of his heart lies a shard of Ven's heart, but he nonetheless
developed into a full heart of pure darkness over the years, just like Ven's developed under Aqua's, Terra's and Master Eraqus's care.
It was said by MX in his reports that these
two hearts need to be trained and made stronger and Nomura also spoke in an interview about Ven's heart not fully formed when he came first to Eraqus, yet as we see later when he develops Ven
does form his heart.
Even though Vanitas was born from Ven, Vanitas still holds his own (complete?) heart. And Ven has has one two. So the two hearts, made from the same person, somehow merged (bbs x-blade)
Correct, there were two hearts made out of one original, almost like a (forced) cell division in biology.
These hearts at exact same strength intersecting (which happened) and then fusing together into one (which only partly happened since Ven's mind resisted) would bring about the X-blade.
Well, he's part of a heart that over time became it's own (whole heart)
Someone we're forgetting is Eraqus... Sure he hid his heart inside Terra, but where did his body and soul go? Eraqus and MX's body/soul suffered the same fate (presumably anyways) (assuming Van didn't take MX's body) Anyways Eraqus in the RoS is entirely plausible, at least part of him being there anyway
As far as who the Red Eyed Unknown is, Van seems plausible for reasons already stated, ASoD was in a state similar to the REU, so Van could possibly be as well, idk... Right now it just seems like there are too many unknowns to be able to say anything for sure, kind of like Riku #2 in the Jump Festa trailer
Exactly.
Eraqus? As far as we know his body and soul were destroyed by Master Xehanort when he was blasted in the back, only his heart survived by hiding inside Terra's heart like Kairi's did in Sora's in KH 1.
MX's body and soul weren't destroyed by an attack, they just "faded". The only thing Nomura had to say about the "fixed sentiment" that remained after MX stabbed himself, is that it is "not a heartless".
Of course that is possible. It's even probable I would say that Eraqus is somewhere in the RoS.
Vanitas being the Red-eyed unknown plausible or not stems from how much everyone individually sees the novels as reliable canon-source or not.
We have in fact only two unknowns: The golden eyed one running around waging a seeming psycho-war against Sora and Riku and the red-eyed thing.