Gabranth will take part in moving bones back to Caer Glaem, but only after he's learned of the whole "restless dead" thing. He'll be riding out to fight the dogs, either on his own or with an assembled party.

J'sairr will also be taking bones back to Caer Scima, but he'll be much more reluctant to do any fighting outside of the court. He can probably be convinced to go out and fight, but otherwise, he'll be sticking close to the castle and helping with fortifications.