Sunderland sporting director Kristjaan Speakman has done a lot of good this summer. But he may have made one mistake. Sunderland enjoyed a prolific end to the summer transfer window, signing four new players on deadline day. Regis Le Bris has also guided the Black Cats to an unprecedentedly strong start to the new campaign with his Sunderland side sitting in 2nd place of the Championship table after a 1-0 win vs Middlesbrough last weekend. Chris Rigg scored the goal and has since taken all the headlines. After previous links to Real Madrid, it’s now reported that Manchester United could make a…