XH's memories? You mean because Ansem SoD saw Kairi and that let's Xemnas resonate to see Xion occassionally as "Xion"?
I truly think you have an error in reasoning here, as KH does not manifest from Hearts connecting but from Hearts being fused/hoarded together.
Master Xehanort describes KH as an aggregate/conglomerate of Hearts in his Reports and also says that the Hearts "gathering in a single place" is what finally causes KH to manifest.
In Days Saix also speaks of it in that manner: "The hearts collected by our two Keyblade wielders, Roxas and Xion, have gathered together; and now, almighty Kingdom Hearts waxes large in the night sky."
Sure, when the hearts are crammed together into a single mass they are also "connected" in a way, but that is different than Hearts just touching and forming a bond like for example Sora and Ventus. Their hearts aren't a single mass, they're still independent from each other physically inside their own bodies, same goes for Riku, Kairi and all the others. The only difference is when Ven's heart seeks refuge inside Sora's at the end of BBS and Kairi's heart in KH 1. In these cases the hearts are truly physically together, but they still remain independent from each other, Sora's heart doesn't assimilate Ven's or Kairi's heart to destroy/suppress their individuality, they don't form a totally new heart out of both, it's just one heart inside another. Even Roxas' and Xion's new hearts are still independent inside Sora's. If they weren't, there wouldn't be a chance to save them and have them exist again.
Why would a new heart be created just because XH connects his heart with Young Xehanort's? The reason Young MX can time travel with his body is because XH already fulfilled the "cast away your body"-condition so Young Xehanort doesn't need to because he's also "a Xehanort" and therefore XH fulfilling the condition counts for all of them since they all have a seed of the same heart within them.
I think Nomura even said in the Ultimania that Young Xehanort was only borrowing the time travel powers and doesn't have them permanently besides functioning as a portal so the other Xehanort's could reach him.
One statement of Nomura regarding Xemnas and Ansem I found particulary interesting:
This almost sounds as if Xemnas and Ansem were "stored" somewhere entirely outside/beyond the timeline instead of in their own time periods. o_0
(Or I misread the meaning of the second part of the question after the comma).
I would certainly hope not, as then the whining about how they are "clones" or worse the same person would start again in the fandom.
That would be for sure the case, and I would guess that there would be also less character bashing and shipping wars in general when people would understand the series mythology better from the ground up. While all the main characters have their fair share of shipping-madness going on (seriously, all the "lack" of romance and more naughtly stuff that the canon has gets trumped twice or thrice by what the fandom cooks up in fanwork) the rabid Organisation XIII-fangirls are truly another league worse. Especially since with these character derailment (and frequently mispainting the Org as "good guys") is abundant.
I'm not generally against shipping and I have also no problem with same sex-pairings in general as long as all that remains in the fanon.
I truly think you have an error in reasoning here, as KH does not manifest from Hearts connecting but from Hearts being fused/hoarded together.
Master Xehanort describes KH as an aggregate/conglomerate of Hearts in his Reports and also says that the Hearts "gathering in a single place" is what finally causes KH to manifest.
In Days Saix also speaks of it in that manner: "The hearts collected by our two Keyblade wielders, Roxas and Xion, have gathered together; and now, almighty Kingdom Hearts waxes large in the night sky."
Sure, when the hearts are crammed together into a single mass they are also "connected" in a way, but that is different than Hearts just touching and forming a bond like for example Sora and Ventus. Their hearts aren't a single mass, they're still independent from each other physically inside their own bodies, same goes for Riku, Kairi and all the others. The only difference is when Ven's heart seeks refuge inside Sora's at the end of BBS and Kairi's heart in KH 1. In these cases the hearts are truly physically together, but they still remain independent from each other, Sora's heart doesn't assimilate Ven's or Kairi's heart to destroy/suppress their individuality, they don't form a totally new heart out of both, it's just one heart inside another. Even Roxas' and Xion's new hearts are still independent inside Sora's. If they weren't, there wouldn't be a chance to save them and have them exist again.
Why would a new heart be created just because XH connects his heart with Young Xehanort's? The reason Young MX can time travel with his body is because XH already fulfilled the "cast away your body"-condition so Young Xehanort doesn't need to because he's also "a Xehanort" and therefore XH fulfilling the condition counts for all of them since they all have a seed of the same heart within them.
I think Nomura even said in the Ultimania that Young Xehanort was only borrowing the time travel powers and doesn't have them permanently besides functioning as a portal so the other Xehanort's could reach him.
One statement of Nomura regarding Xemnas and Ansem I found particulary interesting:
This almost sounds as if Xemnas and Ansem were "stored" somewhere entirely outside/beyond the timeline instead of in their own time periods. o_0
(Or I misread the meaning of the second part of the question after the comma).
I would certainly hope not, as then the whining about how they are "clones" or worse the same person would start again in the fandom.
That would be for sure the case, and I would guess that there would be also less character bashing and shipping wars in general when people would understand the series mythology better from the ground up. While all the main characters have their fair share of shipping-madness going on (seriously, all the "lack" of romance and more naughtly stuff that the canon has gets trumped twice or thrice by what the fandom cooks up in fanwork) the rabid Organisation XIII-fangirls are truly another league worse. Especially since with these character derailment (and frequently mispainting the Org as "good guys") is abundant.
I'm not generally against shipping and I have also no problem with same sex-pairings in general as long as all that remains in the fanon.