To take Spurs from where they were 20 years ago to where they are today. I think that is the sign of a great boss. But you right. I don't know much about his abilities as a leader.
How much did that have to do with Levy being a great boss and him taking advantage of the natural advantages that Spurs had/have?
Credit to him for capitalizing on those things, but he didn't exactly take over Burnley and make them into one of the richest clubs in the world. He took over a London based club, with a massive fan base, a strong history and one of the bigger clubs in the country.
I am not sure that Levy did something that many other owners couldn't have done as well based on the club that we are. In fact it is likely many other owners could have done even more.