(This is part two of a two-part series. Part one published on Monday.)After U.S. District Judge Robert W. Gettleman ruled that Wayne W. McFarland Jr.’s equitable contribution claim against Z. David Patterson failed to allege a necessary ingredient — a joint financial obligation — because the third-party complaint merely said they “separately executed the same form guaranty agreement,” McFarland tried again with an amended complaint based on allegations about a “contribution agreement …