Ally Financial may be getting closer to ridding itself of its non-agency mortgage unit, ResCap, the residual of a business formerly known as Residential Capital that helped invent the jumbo securitization and Alt A markets. According to reports, Ally is weighing putting ResCap into bankruptcy as a prelude to selling the business to Fortress Investment Group or another suitor. Ally’s primary mortgage business, GMAC Mortgage, is a top seller-servicer in the agency market. ResCap and GMAC Mortgage are separate entities that are both subsidiaries of the holding company that also owns Ally...