They don't need to have that specific moment happen twice, instead they can add a different Aerith scene during the LS sequence. I don't mean actually having Aerith be there though. It would just be a memory of her, that Tifa is helping him with. Aerith's death would be the perfect candidate
What if they expand it to include his memories of Aerith's death and Zack's death? Tifa was not there for Zack's death so I don't know how that would work. Aerith's death maybe since Tifa was there.
The LS sequence is a love confession from Cloud to Tifa, and the realisation from Cloud that Tifa loves his true self, that he doesn't need to be a hero for her to love him. Can you imagine DEATHS being inserted into that? It's supposed to be a moment of glory and hope for Cloud as he pieces his self back.
Zack's death in the OG was not inserted in the LS sequence, even worse it was moved from being right after to the Nibelheim Mansion to avoid exactly that, conflating a death with the LS sequence.
It’s not just about him needing to recall what happened to Aerith or Zack. It’s about Cloud needing to know that he actually is a person and not a clone or a puppet as Sephiroth loves to say.
This, so much this. The LS sequence is a very intimate moment, Cloud lets Tifa
in his mind.
In the end we're left in the dark
I drift alone evermore
Finally think I can say simple words I couldn't before
I love you.
This is the hint from Akira to the LS sequence. Whether Cloud does vocalise an "I love you" or not, the LS sequence remains romantic by nature. Can you imagine going into a friend's mind to help him with uh... his memories of the girl he loves? Yeah I don't think so.
I don't really see how it'd have to be a rewrite of the meaning of the LS sequence though. Tifa would be helping Cloud with another shared memory they have with each other. A huge shared memory they have to be exact.
There will be a rewrite, to me it's evident as they have Tifa already knowing about the most important memory, the one that proves Cloud is Cloud Strife of Nibelheim: that he wanted to help her when she fell off that bridge after her mother's death.
The fact that this precise memory was presented, that they talked a lot about their memories during the sidequests and main quest, all of this makes me think that they're going to focus on
feelings, hopes and dreams rather than
memories. It's what is attached to those memories that make them important; it's Cloud's love for Tifa that make those memories important. So we're going to dive deeper in Cloud's mind since that memory alone cannot prove he's Cloud Strife anymore, but going through probably a lot of memories that will be answers to Tifa's memories in ToTP, and the feelings attached to them. It's the fact that he does love that will prove that Cloud is the true Cloud, IMHO. Well that's my theory anyway, since that precious memory already has been used, and given what Rebirth presented us.