Okay, Hirou has evidence that Vhazhar is a moral savant. But the reader, and Hirou, sees little evidence that Vhazhar has worked out a formal, rigorous theory of Friendliness. I thought that anything less than that, on your view, virtually guaranteed the obliteration of almost everything valuable.

But I draw a weaker inference from Vhazhar's ability to overcome indoctrination. Yes, it implies that he probably had a high native aptitude for correct moral reasoning. But the very fact that he was subjected to the indoctrination means that he's probably damaged anyways. If someone survives a disease that's usually deadly, you should expect that she went into the disease with an uncommonly strong constitution. But, given that she's had the disease, you should expect that she's now less healthy than average.