Akiho and Sakura are now sisters, which seems to be good for both of them, but Momo said that this exchange created inconsistencies, following the logic for Akiho to be happy and not be in her old family's plans anymore. evil path, in theory it is Kaito, but emphasizing here the idea that everything needs an equivalent price for such great happiness for Akiho when he imagines it to be that seems little.
In addition, Kaito from what he suggested is no longer remembered by anyone, but following Tsubasa's logic where Sakura, even without remembering Syoran, recognized his importance and even missed him, it is possible that Akiho did have a feeling of loss constant towards him, which could be fundamental for someone to understand what happened, either her or Sakura, and reverse things.