Sunderland and Kristjaan Speakman may be making another critical error in the transfer market, given recent rumours. For Sunderland, nothing short of a perfect summer and transfer window is needed. Owner Kyril Louis-Dreyfus and sporting director Speakman are two men under the spotlight following a season which held so much promise, but ended with so much disappointment. The Black Cats finished the season in 16th after a 2-0 defeat against Sheffield Wednesday; a team who were bottom of the table for the vast majority of the campaign, but who finished just three points behind Sunderland in the e…