If Senna hadn't let Berger win in Japan '91, he would be ahead of Prost on that list.
It's an interesting statistic though. But in terms of "greatest drivers", there are heaps of other factors to consider as well. Such as the competitiveness of their cars, reliability (which has improved over the years), and the competition around at the time.
Interesting to see that someone like Tony Brooks, who is seldom mentioned on a "greatest drivers" list, is as high as 11th here. In that respect, this is also an interesting statistic, because it makes you consider drivers who you may not otherwise have thought of in this context. Thanks for sharing.