Living Warriors are typically not used as it could cause nepotism or further blood feuds and vendettas. It is also possible the Warrior might do something unforgivable before they die and thus they and their descendants might need to be reaved. Its cleaner for Scientists to let a gifttake 'age' for a little while in order to prevent this occurrence. That said Maeve Wolf, Alaric Ward, Phelan's descendants, and several Society Clones of Aidyn Pryde do exist that were created using living donors.