once a faster runner wrote:
I just looked up the ten fastest Marathoners, all-time on IAAF site. Four of ten have sub-27:00 10000m PB. All of top ten are sub-28:45 10000m runners.
The four: Kenenisa Bekele, Eliud Kipchoge, Haile Gebrselassie & Tamirat Tola.
We can state: racing a sub-2:05 Marathon, it is not necessary to have sub-27:00 10000m speed.
Not necessarily true. It could easily be the case that each of those 6 who didn't go sub-27 were not training for the 10,000 when they raced it. If training properly, they may also be capable of sub-27 (or previously capable in their most prime years). Some could have also recorded their technical 10,000m PR before they were fully trained, but never bothered to race it again, or not on the track, when they reached peak fitness, as the marathon would be more lucrative.