My dad once said that great players very rarely made great managers, using bobby charlton as a prime example, the only real exception I can think of is possibly pep guardiola, and at a push pochetino although pep has won everything, was he a “great” footballer.. pochetino is another, but was he world class? (He might be) however, not won owt yet as he really..
Fergusson, Clough, Paisley, Shankley, amongst others were hardly world beaters but were exceptional managers, Dalgliesh was a great player, and had success as a manager, but not on the same level and wouldn’t be classed as a “great” amongst managers..
Gazza wasn’t a great manager was he? Fun in the dressing room no doubt though..