True, really the only particular here is disputing the tissue-paper thin theory that the third sacrifice never involved ensouled beings, and was just putting ancient cows and chickens into a woodchipper, a theory that as of Tales Of The Dawn, has been doused in water.The particulars of it don't seem all that important to me.
Seems to me that the ancients crossed a moral event horizon as soon as they started trying to use the lives of future generations to bring back those that they had lost.