Yes, that's the problem here - these two are both totally nondescript runners. In their entire ultra careers their returns are:
RB 468/2088
WG 311/2134
If it appears they haven't done much racing, you'd be right. They clearly avoid real racing like the plague. When they race in public, their returns are pretty awful, but when they do their private stunts, they're faultless and imperious, albeit minus a human pulse. WG will be 10/700 here. Compare that to the above.
RB covered just 87.5 miles in a 33 hour race, and took 27:33 over a 100 mile race, yet for a private venture in Central Park, slams down 100 miles in 18 hours with a 1,349m of climbing [and no recognizable human pulse for a vast majority of the second half].
WG is very much a 3:05 man in the marathon, but in private run in Battersea Park, he'll rip you out a 2:50. And at Marathon des Sables his endurance limitations were hopelessly exposed, getting crushed by a W45 in 3:58 marathon shape.
But these companies who sponsor them absolutely love their huge followings they can influence sell through. Give them a choice between a pro runner with 25k followers, or WG and RB with 200k combined, and they'll take the latter any day. Balenger alone has more followers than Aleksandr Sorokin, and WG over four times that.
WG back on the ski poles today, seeing footage of him running is down to a few seconds a week, but still the conviction remains that they'll be done in a week, which would be some going. It's almost as if they know something we don't.