Biased Aussie here.
Just noting the hypocrisy of Jess's 1500m 5 sec improvement- DoPiNg!
Vs US Trials. Nikki Hiltz 4 second PB, Emily McKay 4 second PB, Sinclaire...similar. OMG Team USA is AMAZING!
Jess is a smart competitor with a smart team. They have been focussed on peaking at Paris for years. Every other result has only been a prelude for this Oly-period. She's now in 3.52 shape due to uninterrupted training, altitude, she's probably a couple of kg leaner for these few weeks. AND she got lucky and drafted the GOAT on the very inside of lane 1 all the way.
Jess has been a gun for years. She's just upped her confidence. Watch ESP and others do similar in the next few months. 3.53 is the the new 3.57 because they believe they can and they are training towards it.