In a surprise turn of events, he's actually very "soft" at sneezing, so Koishi still has the powerful sneeze in Gensokyo, and maybe even the whole universe.
What if Byakuren's idea of stopping Taoism from spreading in Gensokyo is to go to Miko's mausoleum and beat up everyone there?
BTW, glad to see that the answers are becoming funnier! Please keep up the good work!