While jumbo MBS issued in recent years have performed exceptionally well, some senior-support bonds on new jumbo MBS have credit risks similar to what was experienced during the financial crisis, according to analysts at Andrew Davidson & Co. In a recent analysis, Richard Ellson and Allison Ying raised concerns about the super-senior structures that have become common on jumbo MBS in recent years. They noted that when Redwood Trust started working to revive jumbo MBS issuance in 2010, the issuer used a much simpler structure. However, in the past few years, Redwood and many other issuers have increasingly used...