As far as I'm concerned, you should use whatever you wish in the introduction that will get you the best marks. Basically, if your use of a particular quote will IMPRESS the examiner, then go and use the quote!
It's far to general to say "you always should" or "you always shouldn't". There would be various situations where you could use a quote to great effect, and others where you wouldn't. Common sense goes a long way here.
There is also no golden rule to whether or not you "always should" or "always shouldn't" put the texts in the intro. You should put them in the intro if they will work, be relevant, and not detract too much from the intro.
In my essay which scored full marks on the 2011 exam, my contention for my expository essay was "Authors write books for a reason.". In my essay, I tried to convince / expose the examiner that Authors don't "just write books for fun". I tried to show that there are profound reasons that authors choose to write - they want to show their true colours, give their opinions, educate their audiences, and challenge the way people think. They also pick issues that are relevant to them.
For me, therefore, in the introduction I needed to lay out the groundwork for all these ideas. For me, it was critical to mention the books and their authors, because my whole essay was based on the texts that I included.
For others writing an expository, this might not be the case. For example, if you are writing an expository essay that would benefit from just vaguely mentioning or alluding to a theme, character, or notion in your book, then you shouldn't blatantly put it in the introduction.
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