I noticed that if the Kaliphate occupies the mainland Kingdom of Jerusalem provinces, they are ceded to them by event. However, after that, as Bavaria, I went on Crusade, cleaned up the Anatolian Turks, created some christian states in the area, then went up against the (quite powerful) Kaliphate with 30 000 men, smacking them around a bit before capturing Judea and getting it in a peace deal. Now, shouldn't there be an event for anyone owning Judea or Samaria or Lebanon who is Christian and not the Kingdom of Jerusalem to cede the province(s) to the KoJ? It makes sense. And also an event that relocated the Jerusalem capital to Judea once they have the whole kingdom back or somesuch