Fulham defender Timothy Castagne believes Jeremy Doku has actually improved so much in one area since joining Manchester City. Doku has just completed his debut season at the Etihad Stadium, following his £55 million transfer from Rennes. Doku was used in rotation with Jack Grealish on the left mostly, and ended up making 45 appearances for the club. The Belgian scored seven goals – his last coming in the FA Cup final against Manchester United – and made 10 assists. Doku has excited City supporters with his direct style, rapid acceleration and dribbling, but he’s also lacked consistency, which…