I think this was one of Tilson's failings. He and Brush did not seem to be able to improve players, either those graduating from the academy, or those he brought in to the club. I wonder if the likes of Prosser or Leonard would have progressed under Tilson in the same way they have under Sturrock and Brown.
The likes of Maher, Eastwood, Benno, Guttridge, arguably Gower, Barrett, Flahavan, Che Wilson, Pettefer, Wayne Gray etc all played their best football under Tilson.
The big difference between Tilly and Webb's teams was that Webb did the same with a young exciting team at the start of their careers, whereas Tilly's double promotion team was generally at the peak of their careers.