(Bloomberg) -- The rapid unraveling of Lex Greensill’s trade finance empire is leaving one of his biggest backers with some unpalatable choices.Credit Suisse Group AG, which set off a cascade of events Monday by freezing about $10 billion of funds that it ran with Greensill, is having to pick between saddling fund investors with potential losses, or taking the assets on its own books and irking shareholders and regulators.