Interesting, I could see the challenge with new controllers.
The diverging data points of the two flights I reference seems to be here:
Today:
37.5730 -122.2660 299° West 187 215 2,200 -1,080 Descending
AF84 4 days ago:
37.5790 -122.2790 300° West 187 215 1,600 -1,200
Same place, same speed. But 600’ more altitude today.
A few more data points down AA is basically at same position AF landing from 4 days ago. But AA’s speed keeps dropping well below the 145 kts that AF maintains and AA is continues to drop with a higher rate of decent.
AA Today:
37.6016 -122.3340 297° West 141 162 600 -1,320 Descending
AF:
37.6020 -122.3360 296° West 145 167 600 -840 Descending
In layman’s terms was this simply a sharp over-correction that could not be adjusted again once he reached the correct profile? i.e. he put it in a stall to fix the 600’ extra altitude but could not stop it once the correction was done?