Sunderland's promotion to the Premier League this summer was impressive on a number of levels. A head coach in Regis Le Bris, in his first season in English football, laying waste to the theory of needing significant time to adapt working within the cut and thrust of the Championship. A club who had only returned to the second tier in 2022, without parachute payments to boost spending on transfer fees and wages. But all underpinned by an incredibly youthful squad - their average starting age of 23 years and 316 days was the youngest in the division - with academy graduates forming a consistent core.