Totally unrelated to the game, but in Hindu mythology the caste determines what actions are virtuous. For a Kshatriya (warrior caste), it is virtuous to fight and gain honor through martial prowess, performing great sacrifices (of animals, rakshasas, nagas, etc.) and amass wealth and kingdoms. For a brahmin on the other hand, virtue is accumulated through knowledge, ascetism, forgiveness, wisdom, etc.
So for the brahmin commander (presumably the guru too) it might make sense for them to reincarnate into a lower path based on kill count. I can't say if that's something KO thought about when he designed the reincarnation mechanic though.
