A massive re-write of the disclosure requirements for issuers of non-agency MBS and ABS is in the books. But while most issuers say they are complying with the principles of so-called Regulation AB, a number of major questions still linger. “It’s sort of like a perfect storm of turmoil and change,” said Steve Kudenholdt, a partner in the Washington, DC, firm of Thacher, Proffitt & Wood, during a discussion of Reg. AB at this…