I don't agree at all. In what universe is modern Aikido the best possible product? Why would we declare our Aikido adequate and not pursue the depths of Aikido's possibility just because our progenitors were of questionable morality? Hell everyone is of questionable morality.
I think you are misunderstanding Cliff. He's not suggesting we "declare our Aikido adequate and not pursue the depths of Aikido's possibility"; he's suggesting that the way aikido has supposedly
evolved away from its starting point (that is, Ueshiba) might be a good thing.