If you read the history of Roe v Wade, the initial decision was going to be 5-4, and then CJ Burger and another justice joined the majority in order to provide input and to make a historic decision seem to have greater support. Burger was a terrible CJ, but the Senate was in Dem control in those days, and they wouldn’t allow conservatives on the court. Nixon tried to get one, he got shot down.
Thank you for moderating my speculation with some real information.