Obviously, the property you should be interested in here is fame. Below a ranking of the philosophers included in Leiter's list, sorted by fame (measured in dBHa, the international logarithmic unit of fame, see Schulman 2009).
https://people.ucalgary.ca/~rzach/blog/2009/03/whos-most-famous-philosopher-of-20th-century.html
The top 8 are [Russell is number one] B-list celebrities, 9-31 are C-list, by Schulman's standard.
Leaving aside how mind boggling it is that there is a quantitative measure of "fame" or indeed why anyone would want to be a philosopher if the best they could ever genuinely hope for is a panel game show host (I'm looking at you Elizabeth Anscombe), I wondered: is there a quantitative measure for a philosopher's skill?