In his stated effort to upstage Knicks owner James Dolan, Nets owner Mikhail Prokhorov has become him. Like Dolan, Prokhorov desperately wants an NBA championship. Like Dolan, he has pursued that desperation with financial abandon, giving his GM an open checkbook. Like Dolan, he has overspent on overvalued big names. Like Dolan, he has mortgaged his team’s future by giving away multiple draft picks. And like Dolan, he appears headed down the abyss. In two months, the Nets have gone from contenders with