, Former D.C. United prodigy and lightning rod Freddy Adu is off to Benfica of the Portuguese League, reports Steven Goff at the Soccer Insider. When Adu came to United at the tender age 14, his arrival inspired fanfare within Major League Soccer that has only since been surpassed by some British geezer. After three up-and-down seasons with United, Adu was sent to Real Salt Lake for a major allocation (a powerful tool in MLS…