He'll be glad that Eirin, Kaguya, and Reisen don't have issues, at least major ones, with him "declaring war on the moon" back in 1969.
What if Touhou 15 features a completely new cast, including playable characters, but still takes place in Gensokyo, and in-game dialogues explicitly say that the game takes place a few days after the events of 14.3 and even mentions the names of old characters, despite them not showing up at all?