Not only did Citigroup shock the market this week with its decision to exit residential servicing operations, but the move could be the start of an eventual withdrawal from all mortgage banking. For now, the nation’s sixth-largest servicer – and 13th-largest originator – is strongly refuting such talk, but that isn’t stopping the industry from speculating on the megabank’s next move. “If they firmly believe they can’t make money in servicing and cross-selling, then this is...