Mortgage industry veteran Lewis Ranieri says big banks will easily dodge the risk-retention requirements for mortgage securitizers that have been proposed by federal regulators. Issuers of non-agency mortgage securities that aren’t backed by “qualified residential mortgages” would have to retain a 5 percent interest in the transaction. In a joint comment letter submitted by Ranieri and Kenneth Rosen, chairman of Rosen Consulting Group, a real estate research firm, the pair warned that risk retention as proposed will benefit ...