Yes, Cooper has consistently said that he had other sources. He claims to have even talked about them before the Grand Jury. But for some odd reason the media never seem to ask him about them, like who they are or when he talked to them? Was it before he talked to Rove?
But you raise a good point, that Wilson could have told somebody at this point in time who told Cooper. It is very clear that Wilson was a busy bee. He was telling people at the Nation, the NYT and the Washington Post about his "investigation."
It wouldn't surprise me if he wouldn't have worked in the fact that his wife was at CIA--to try to authenticate his tale and pump up his own credibility. After all, the NYT and WP were posting some damn serious charges--that the nation went to war based on a lie told by its President. And who the hell is Joe Wilson?
So yeah, it's highly probably that Wilson would have managed to work in the fact his wife was with the CIA, to try to give the story more authority with these reporters.
Wilson in some ways reminds me of one of my brothers
He likes to pretend he's big man on campus and brag about how great he is
Wilson is like that also
IMO .. Wilson is a willing puppet for someone else though .. someone big wants to keep pushing this stuff