I think the real question is how do we retain information better, if that would happen, then surely you don't need someone to actively remind you of hidden information. If I retained 1% of the stuff I've read in the past, I'd be the equivalent to an encyclopaedia. I write tutorials sometimes, and my ability to write good ones has never depended on the presence or absence on participants.
In his essay "How The Type Of Advice Someone Can Give Can Change Over Time", the author of SucceedSocially.com writes:
If you're trying to learn something, it's natural to try to find the best people in the field to learn from. And if you're thinking of sharing your thoughts on something, it's natural to think twice unless you have a proven track record of accomplishments in that area.