Aston Villa have overseen plenty of departures during the summer transfer window. Unai Emery and Monchi have been building a team at Villa Park that should be able to compete in both the Premier League and the Champions League this season. However, this has not come without a cost. The Birmingham outfit has been forced to let go of many of its star players from last season to raise funds. Douglas Luiz was the most heartbreaking departure as he left for Juventus in June. However, one player who surprisingly left the club was Moussa Diaby, with Emery now explaining that it was the winger’s decis…