According to Richard Justice on his SportsJustice blog:
"I’m told Drayton McLane ordered Purpura to trade Brad Lidge. I got this information from an official with another team. I would expect the Astros to deny it."
Justice also mentions that Roger Clemens is pushing Drayton McLane for help, who has in turn orderd GM Tim Purpura to make something happen.
Mets closer Billy Wagner is campaigning for Omar Minaya to bring Lidge in so Wagner can fix him.
Also, I’m told Justice was recently on 610 AM in Houston. He mentioned that if the Astros trade Lidge for Hank Blalock straight up, the subsequent move would be to swap Morgan Ensberg and Adam Everett for Scott Linebrink and Khalil Greene.