Residential Capital’s filing for bankruptcy early this week signaled Ally Financial’s exit from the mortgage industry, and though the transfer of its servicing and origination platforms will not change the market in a meaningful way beyond industry rankings, the legal situation could offer a paradigm for other beleaguered mortgage units to follow. “It wasn’t a monstrous event,” said one industry observer. “It was an unfortunate event. Everyone knew they missed an interest payment, so it wasn’t much of a surprise.” ResCap includes both GMAC Mortgage, Ally’s mainstream mortgage banking operation, and what’s...