He was too surprised and pleased with himself to have been 'in' on it.
I listen to him everyday although not live and I saw the Drudge headline before I logged onto his site to listen to todays show and to me his surprising reaction was a case of over acting. But then that's just my opinion.
Because if he really did what you are accusing him of doing, then he's a liar.
Heck, I've been saying since Edmond's identity was revealed that it sounded like the page was making a fool of Foley in the IM exchange. I have a son, not much older than Foley and I could see a kid leading this guy on, as a joke.