That's actually okay. It's really no different than handling the case in NTP. You find the outliers and you exclude them. At least with the "NTP bit" you can exclude non-synchronized stations sooner in the process. It also helps prevent non-synchronized stations from "chasing" each other as if they are legitimate time sources. As a footnote, things like this are why I haven't invested more time in the auto-sync project for WSJT-X -- if they would just implement real clock recovery in the mode itself, all this extra stuff is unnecessary. I understand that it's not a simple problem to solve in a performant way, but not solving it leaves people like me to find other less-perfect solutions for off-grid operation.