Considering that Aerith and Cloud are both mimicking Zack's mannerisms and gestures, I wonder if they feel a sort of wistful nostalgia around each other? Cloud more subconsciously than Aerith, I would guess.
Lol, I've seen extreme CAs who were absolutely adamant that the kids were carrying buster swords because of Cloud, not Zack. Granted, they hadn't even played Remake and they have a vested interest in not playing Remake. But considering that it doesn't make sense for them to make those homemade swords for patrol
before Cloud's even made it back to the Leaf House from saving the other kids, I can just imagine Zack visiting the Leaf House with Aerith and sitting around crafting them for the kids. I just really wanted to see it too.
(Is greedy, lol.)