Wilmington Trust Co. is taking aim at Capitol Bancorp Ltd.'s bankruptcy case, calling for the appointment of a creditor group to delve deeper into the bank-holding company's proposed route to reorganization, Dow Jones DBR Small Cap reported today. Capitol Bancorp, a struggling Michigan company that has community banks scattered across 10 states, sought bankruptcy protection earlier this month with a restructuring proposal already in hand. Wilmington Trust said in a court filing that only $17 million of some $151 million in holders of trust-preferred securities cast their votes on the reorganization plan, leaving 89 percent having not weighed in.