Much of the PL was influenced SAF's brand of football until recently. Up until 2010 the league's top sides utilized was basically a 4-4-2, high winger, high tempo intensive football with high pressing. Obviously if we're talking about a "visionary tactician", what type of a manager do you classify as such? Michels, Herrera and possibly Cruyff are the only ones who fit that definition, imo. But I'd easily place SAF in the same bracket as Guardiola and Klopp when it comes to tacticians. Even a little bit higher since SAF knew when he needed to adapt while Guardiola and partly Klopp are shown to be extremely rigid in their approach to the game.