I think that "leading the client to the answers" thing is due to the fact that if somebody finds the answer for themselves, it will stick more. If somebody explains to me some proof of a concept, I won't remember it as well as if I proved it myself. Plus, it gives you a sense of accomplishment, which might help you a bit too.

That being said, I like it the way my T does it: he first tries to get me to find answers myself. If he realizes that this won't work, he'll make it more obvious.