You really have no idea of knowing whether or not that is true. Thomas was a great unknown when he was nominated. His record was almost as sparse as Meirs and certainly more sparse than Roberts. It was predicted by the folks at National Review that he would perform similar to Souter. Nothing is clear until the judges actually sit on the bench. AND IT NEVER HAS BEEN. Do you think Reagan and Bush I intentionally put weak conservatives (at best) on the court? I don't. Until we verify one of us is clairvoyant, any predictions about what kind of justice Roberts or Miers will be on the court are worth about as much as all the rest of the opinions we post on this site. Not much.
And you still avoid guessing where Bush will go with his next appointment.