If they go on a sea voyage, he can take care of the kingdom, assuming Azumi is going.
Speaking of a sea voyage, this could be very complicated. For one, how will non-guild members such as Alice go with them? Oh wait, she is after the jewel, so if Azumi brings it with maybe she will sneak on board.
Another thing is that my characters will be terrible at combat on boats. Maira will have very little healing power except in coral reefs, Kaiden will have trouble summoning anything other than Lileep, Omanyte, Kabuto or Anorith, I think, and even then it will take longer, and Rolen will be seasick for at least a while, and even then he still won’t be the greatest combatant. On islands is another matter, but on board the ship...