The author of the two threads were penned by Sam Wada. Doc Sartin named Factor W after Sam Wada who I believed came up with the computation. I had the pleasure of hearing his presentations in some Sartin seminars, many years ago.
I have these two threads saved under my favorites as one of those great threads on this site.
I enjoyed Wada's approach in analyzing each contender in a race and his use of the Early/Late graph. But I enjoyed his level of confidence when he saw a "match-up advantage" in a specific race and his use of a "prime bet" when the occasion arose.
Yes, there are several posters who have posted great threads in their limited contribution but they provide great and compelling insights in our shared endeavors.