Manchester United have not quite figured out Aaron Wan-Bissaka, and interest from the Saudi Pro League throws up an unexpected opportunity. Aaron Wan-Bissaka has been a consistent performer for Manchester United since signing for the club for £50 million in 2019. Perhaps in a period of stability, with stronger players around him and consistent management, Wan-Bissaka would be more highly regarded. Yet, five years on since his arrival from Crystal Palace, it is fair to ask whether Wan-Bissaka has actually improved over the past five years, or simply remained at the same level. Aaron Wan-Bissaka…