JAN MOIR: As Prince's chief of staff departs after briefest of tenures... So why is it that few aides in Harry and Meghan's court have lasted longer than the gestation period of an elephant?

Three short months after he was hired as the man to guide Prince Harry through the next stage of his life, aide Joshua Kettler is out. He has moved on, gone with the wind, visible only in the rearview mirror.