Yes Phizzy the JW Org's view of being " Spirit Directed" is very muddled. I agree with you about that and about the evidence showing they are not directed by Jehovah's spirit. I remember reading in one article by the WT Society that the WT Society while saying the holy spirit is not a person also says specifically that it has intelligence. When I read that I was thinking "Huh? If it has intelligence doesn't that mean it must be a person, or does the WT mean intelligence in some way like an AI (artificial intelligence) computer program?"
I never thought of using non-WT literature to prepare talks to be given at the Kingdom Halls, and while an active JW I never even owned non-WT books about the Bible or theology. I did notice though that my JW mother and her JW parents both had a non-WT Bible Dictionary (the same Bible Dictionary edition). I suspect that particular Bible Dictionary (and a RSV Bible) was once made available to the JWs through the literature counter (prior to the WT producing the Aid book). It was the one called The New Bible Dictionary, edited by Douglas. I now own a used copy of that book. It is copyright 1962.
After I became inactive and obtained old WT books (most of which I found from a thrift store, though some I bought on eBay) I later noticed in a WT book from the 1940s (the decade that the Theocratic Ministry School was created) that the WT invited JWs to make use of conservative Bible dictionaries and commentaries (though with caution) in preparing talks for JW congregations. The WT also encouraged them to use Bible concordances, including ones which stated the underlying Hebrew or Greek word for the English translation, and to see how the word was used throughout the Bible, in order to see what the Bible teaches on that topic. I recall that it is an approach which the WT says that Russell used in his study groups (before he created Zion's Watch Tower) to learn what the Bible said about the soul and hell and other words used in the KJV Bible.
While Bible commentaries are useful I notice that what they say often conflict with each other. That makes it disconcerting, to me, and challenging when using those commentaries.
Like you, I also am displeased by the WT's "Quote Mining" and by their dishonesty. Their frequent dishonesty it makes me wonder if the people in charge of the WT's writings really think of themselves as faithful true Christians.