LONDON/FRANKFURT (Reuters) – It would be an insider trader’s dream to know ahead of time which of Europe’s banks will fail or need more capital, and all that data will be stored somewhere in cyberspace as the European Central Bank assesses the euro zone’s top banks. The chances of a leak are multiplied by the thousands of consultants who will work on data for the ECB’s Comprehensive Assessment of the currency bloc’s most important 128 banks, which include household names like Deutsche Bank and Santander along with national champions Bank of Cyprus and Bank of Valletta.