Rating Gretzky to LA and other landmark NHL trades Author:Brian CazeneuvePublish date:Aug 9, 2013Wayne Gretzky haunted his former team by leading his Kings past the Oilers in their first playoff series.Robert Riger/Getty ImagesNew York easily got the better end of the Mark Messier trade.Steve Babineau/Getty ImagesFormer Canadiens goalie Patrick Roy's arrival in Colorado turned the Avalanche into champions.Denis Brodeur/NHLI via Getty ImagesBoston icon Ray Bourque concluded his Hall of Fame career in grand style with Colorado.Brian Bahr/Getty Images