Over his 55 years on Wall Street, Wilbur Ross became known as the ‘King of Bankruptcy’, a nod to his penchant for buying, and then reviving, troubled businesses in weatherworn sectors.  The New Jersey-born billionaire, who was bullied in school but built up his confidence by punching a bag in his garage, had repeated the trick in sectors such as steel, coal, telecommunications and textiles during his career. Thirteen years ago, with the global financial crisis at its peak, Ross turned his attention to rescuing banks.   He started in America, but one day received a call from Prem Watsa, a…