It's no problem at all. I crossed out most of the stuff on this list that he was involved in! Mostly for my own reference though. If it's okay with you Nill probably won't forget major stuff that Dave was involved in, she'll just sort of have a gap where a person should be that she can't place. If you're not okay with that I can work around it! But otherwise she'd forget nearly bleeding out after getting half shredded by a heartless and be really confused about how she actually survived that. Which can totally be done, but would cause her way more concern than being aware she can't remember someone, since she's resigned to people-shaped gaps.