Consolidation crowned a new kingpin in the mortgage servicing market as Washington Mutual claimed top ranking at the midway point of 2001, according to a new market ranking and analysis by Inside Mortgage Finance. The Seattle-based thrift reported $469.38 billion in mortgage servicing as of the end of June, thanks in no small measure to its acquisition of Fleet’s mortgage-banking business. Washington Mutual finished last year as the sixth largest servicer, after debuting on the