I'm sure Vipam has posed this question already in one form or another, but:
Geb, as dominant as he was, had Tergat and Komen to go tit-for-tat with for a little while. They both broke his world records and he was forced to take them back. They also provided a couple of awesome duels, and Komen beat Geb on one occasion.
No one is near Bekele right now. Who will step up and take one of his records during his career? Can Geb muster up one last hurrah and take back his 5K or 10K record, if only for a brief while? Can ANYONE beat back his assault in the 5 or 10 for even one race? Who? Kipchoge? Chebii? Gebremariam? Sileshi Sehine? El Guerrouj?