Meijen is honored to be asked to go out with those who will be where the glory is. He is pretty sure he can use a sap, but Janiven does not have a sap "laying around" for him to use. Does the party want him to join? Janiven is willing to release him to your group.
Erasmus does not know how to use a sap. He has not been asked to go with the PCs, though Janiven has enough other rebels if you wanted him to go with. His healing skills are useful wherever he goes. Do you want him to join?