One thing that made this WR start to look soft in this race was that these 14:12-14:20 women were paced to 5000m in 14:46 by Alice Aprot (the first sight of whom at the starting line made my younger daughter say, why is a man allowed in the race?), and they had never had such a good pacer. Ayana was running very easy at that point and soon gapped Aprot and the rest of the field, but they should all thank the combination of Aprot and Ayana for running such brilliant times. But when Huddle runs an American record (which I was sure she was in shape to do, given her recent performances) and is gapped by a minute, with a 14:31 close by Ayana, roughly 11 seconds faster than the U.S. 5000m record!, it is obvious that doping is going on. We know about the Meldonium that was rife in Ethiopian athletics--at one point, nine tested positive--we'd didn't learn all those names, and many more tested positive after that but we didn't get the names. We know that there have been Ethiopian women dopers running for other countries. We know that they have no testing facilities in the country. We know that the coach of Dibaba's sister had large quantities of drugs and that T. Dibaba was visiting her sister at Aden's camp when the drugs were found. We know that Ayana destroyed G. Dibaba, the 3:50 1500m runner (this is how good that record is: try running a 61, then another 61 for 2:02 at the 800m, now you can rest a little with a 62, but your pacer already dropped out because she couldn't make it to 800m quite at that pace, she could only manage about 2:04 (as in Dibaba's record), you're at 3:04 now, you have a 46 second 300m, roughly 61.3 pace, to get you home in 3:50. So, that's essentially going a bit over 61 pace per lap for 1500m.
And that was the woman that was destroyed by Ayana in the last 3k of a 5k in Beijing in 8:19 or 8:20 last year.