Manchester City sold Cole Palmer to Premier League rivals Chelsea last summer. For some, that now looks to be a mistake, with Cole Palmer performing exceptionally well for Chelsea since arriving at the club. In fact, this season, the 21-year-old has easily been one of the best attackers in the top flight. In 23 matches, Palmer has scored 11 goals and provided eight assists. It has now been claimed that Chelsea want the Englishman to be their poster boy. While City selling Palmer is now starting to look like a bit of an error, Graeme Souness thinks he knows why the club allowed him to go. Graem…