David Sokol, once considered a possible successor to Warren Buffett, resigns following revelations that he bought $10 million in shares of Lubrizol just days before he recommended that Buffett buy the company.  Is there another shoe to drop? How much damage has been done to Buffett’s and Berkshire’s reputation? What does the news mean for the Lubrizol deal? Who is the likely successor to Buffett now?  Our analysts answer those questions and weigh in with their reactions.