Otts deactivate Venice who is an ally of the Papacy. The Pope had the ships out in the Tyrrhenian for an assault on Naples.
Both Corfu and Candia are equidistant from Tyrrhenian.
Who decides where the ships land? My gut says the Otts since the ally marker is removed in step one of the procedure (insinuating the former ally no longer has a say) and it's the Otts playing the card on their impules.