I could be misunderstanding your question, but I thought this post was about random bits from Timeline A, like, So-and-So lives to be an old painter and dies in Paris and first sends a letter to his old sweetheart in Fandom, and not the urgent "Plz fix us" letters that were sent to Zoe. The second category will cease to exist once Timeline A fizzes out, but if the first group were sent before anybody goes into stasis, then those letters exist in both Timelines and are free to not disappear and therefore went to Zoe as intended.

Also they'll be forgetting about the letters further down the line, like months from now, gradually, and not immediately, and immediately is when they go get people out of stasis. Like this weekend or so, I'm assuming, so everyone is back for classes on Monday. Um. Right?