Newcastle United defender Lewis Hall is playing the best football of his career. The 20-year-old is now a regular starter for Newcastle United, having made the left-back position his own. Hall was excellent during Newcastle’s win over Chelsea, as he showed his former club exactly what they are missing. The youngster has really hit his stride since his loan move became permanent in the summer. Hall is now playing so well that £28million looks cheap. But it has not been a straightforward start to his Newcastle United career. This time last year, big questions were already being asked. He did not…