I find it rather interesting that the WTS quotes various 'secular' sources to back their 'reasoning', however individual witnesses are not encouraged to do the same. They even went as far as to quote a professor of theology. As much as they tell us to be "students of the bible", what that really means is become students of WTS publications ONLY.
On the same token, if we were to use secular sources to make counterpoints to the WTS reasoning, we would be told that such writers, professors etc. do not have Jehovah's spirit and thus we should not be consulting them! Hypocrisy abounds in the WTS!