Estimating a quantity is sometimes tough since some math is involved.
1/10 of 1 percent might be possible.
If you think of the dearly departed, maybe RTJones would be the most recognized since he had a great number of courses in the US and worked in the era of TV golf.
On the other hand, Alister Mackenzie might be most recognized given the annual acknowledgement upon the Masters TV broadcasts since 1956. The Masters having been one major tournament at one course, along being a most desireable sports ticket anywhere, gives another edge to AM.
Which has sold more, Klein's recent biography on Ross or Doak's on Mackenzie ?
Or if the thread keeps going, maybe Hugh Wilson will be more recognized.