Chelsea superstar Cole Palmer took the brave decision to leave Manchester City last summer — becoming one of the few players to leave Pep Guardiola’s sight and continue to thrive at another club. The likes of Leroy Sane, Raheem Sterling and Ferran Torres to name a few found out the hard way that leaving Guardiola’s Manchester City side is a risk that is mostly not worth taking — failing to elevate their respective careers since then. Upon his return to the Etihad Stadium this summer, Ilkay Gundogan admitted that once one leaves City, it is easy to realise the stature and the standard of the cl…