The runners world predictor you remember from 7 years ago? Jack Daniels's formula comes from his book. He is a researcher, professor and coach. Greg McMillan was a researcher and now coach. Runners world is designed for finishing your first 5k, and training for a marathon off 4 days of training per week.
I'll spit some other
statsfor you:
Out of US runners,
425 runners went under 31:00 (638 total perofrmances under 31:00
30:59.88 435. 638. Adam DAVIDSON 95 USA F2 13. Walnut (USA) 17.04 872
72 runners went under 65:40, (99 performances)
1:05:39 72. 99. Carlos TRUJILLO 85 USA F 7. St. Louis (USA) 06.04 968
15 went under 2:15:25 (16th was 2:15:47)
2:14:42 15. 15. Michael MORGAN 80 USA F 15. Chicago (USA) 12.10 1079
Her PRs do not follow any projected trend. Yes, that is a list of guys. Yes, there are many more collegiate 10k runners. But the numbers speak for themselves: A 2:15 runner is not the same as a 31:00 who is not the same as a 65:40 runner.
Individual variation, and a personal bias towards the longer distances does not make up the difference.
The argument you should be making is that she never ran a time-trial style track race. That still doesn't explain her HM time. Further, her
overwhelming bias towards the marathon is way stronger than any other top marathoner.
Kipsang ran 27:32 in a 10k road race. Certainly not his 2:03, but it isn't ranking 400th on the 10k list.
Geoffry Mutai has run 27:19. Desisa, 27:18 on the track.
Her PRs are not normal