Good players help of course, but the true art is building a consistent team that functions as a unit which outperforms the sum of it's parts.
Pulis would be an example, finishing eleventh with a team of largely average players and making us a difficult team that nobody relished playing.
Glasner to a certain extent too.
Yes, we had better players under him , but he was instrumental in changing the psychology of the club that anything was possible.
It was a strange feeling to turn up at a Palace game and think you had a reasonable chance regardless of the opposition.
At the moment Sage does not convey the bloody minded resilience of a Pulis or the supreme self confidence of a Glasner.
The best managers are able in applying psychology to make players believe they are better than they are so they outperform, or alternatively hint the players are not quite good enough so they become determined to prove the manager wrong and again outperform.