Fairly or not, that's how Mark Buehrle, one of the greatest White Sox players ever, would become known if he crossed enemy lines to take a free-agent offer from the Cubs. From superhero to super traitor, all for another four-year, $56-million contract, or something like it. The Cubs are interested in Buehrle, and the White Sox are apparently fresh out of payroll flexibility to bring him back for his 13th season. Oh, mama. This could get interesting.