[Gregstrom]

Reincarnation only happens very rarely (or at least, White Ones only reincarnate as part of your empire very rarely). Any white monkey can reincarnate, I think, and they're vastly more likely to come back as lesser beings (generally sacred infantry, IIRC). I don't think I've seen anything come back as better than a Guru, but that doesn't mean it's not possible.