Phllip ND

 Phillip Callahan Was a member of the San Francisco House and although he left to be a Priest, he helped the team from time to time, starting with helping after a fellow team mate, Julia Walker, had been killed in Ireland.

Doesn't reside on the island, but after Derek's death, he has opted to help others, but not by leading a Parrish. When he heard from Nick that Derek was alive - even if Nick had opted to let him know only after his friend was sure Derek would survive - he immediately returned, although he gave Derek space until Derek was ready to meet others.