Also how does Gudaf Tseguy figure into this? 3:53 in old adidas spikes. What's she doing in DF's, 3:51 indoors?? 3:48 outdoors??
Also worth noting that Laura Muir had these spikes from start of 2019 and is yet to PB in them in the 1500. Her 3:55 from Paris 2016 was a solo effort for 700 yet she still can't beat it. Dibaba also had for 2 years and hasn't come close to getting a PB.
Not to mention T Cheruiyot hasn't got a 1500 PB yet in the DF era.
This really doesn't seem like the super road shoes, at least not as cut and dry. You've got some of the greatest runners of this generation not PBing, while greats in DFs get stomped by people not in DFs, while people like Shelby Houlihan stuck with old shoes and still knocked fifteen seconds off her 5k PB.
I think people may also need to consider placing more emphasis on the so called covid effect, and on lack of drug testing. Too many conflicting variables right now.