The post was made a while ago but I'll still voice my concern again:
In my opinion, the devs have backed themselves into a corner regarding when to best reveal Aerith's death to Cloud. Or, atleast from the point of view that Cleriths could take an otherwise Cloti thing and run with it. It would still be a Cloti moment, but with Aerith's involvement there will be disengenuous people out there who will cling to what few moments they have in part 3.
1. Like the others have said, the Nortern Crater is supposed to be about Cloud, Tifa, and their past. It's a test of their bond. If Cloud's mental fracture comes as a result of Aerith's death, while I myself wouldn't say it's a Clerith thing, we all know who would, and I don't think we'd ever hear the end of it.
2. If Aerith's death is revealed to Cloud during the Lifestream sequence, then it's the same situation; It's a moment for Cloud and Tifa so it doesn't really have a place there. Again, while I myself wouldn't interpret Aerith's death being revealed to Cloud during the lifestream sequence to be a Clerith thing, we all know who would.
3. I would agree that when it comes to revealing Aerith's death to him, since the NC and the LS are moments about Cloud and Tifa, it would only make sense to do it when you return to the FC. However, I've said in the past that if Cloud goes into the LS, and comes out still fucked in the head then it feels insulting to Tifa and her role in the narrative. The LS is about two things; restoring and helping Cloud from his mental anguish and them revealing their feelings for each other. So if Cloud's mind is still stuck in this limbo zone between reality and a timeline in the lifestream, and it still is post LS, then Tifa has only fulfilled one of those things as opposed to both like she did in the original, therefore it feels like her big moment was overshadowed by Aerith somewhat. Well, not necessarily 'overshadowed', but complications introduced because of Aerith, her death, and the decision to have Cloud's mind stuck in this limbo zone is what prevents Tifa from fully having her moment.
What I'm trying to say here is: Atleast one major Cloti/Tifa thing will have to be sacrificed and be falsely interpreted as a Clerith thing taking a Cloti thing by disengenuous people no matter where or when the reveal to Cloud happens.
Then again, that's just how I feel. I could be interpreting the games or things said by other people here wrong, and if so please feel free to correct me if I'm wrong.