Wut? The tail, as far as I know, was not how they reincarnated. From what I understand of it, the reason galka reincarnated was due to the fact the part of the mothercrystal the souls of their race returned to was sealed off in another dimension in Al'Teaiu, preventing the souls from returning, and so when a galka died they would reincarnate, and the shock of dying and being reborn wiped most of their recollection of what their previous life was, or something to that effect.