Barry John, who has died aged 79, is regarded as one of the finest fly-halfs ever to play rugby. The elusiveness of his running and the pinpoint accuracy of his kicking have persuaded many judges that among the rich pantheon of great Welsh No 10s of the past century – Cliff Jones, Cliff Morgan, David Watkins, Phil Bennett and Jonathan Davies – the thin man from Cefneithin deserves the crown.