How sad for them, and the US, because this is our best pair and it's in our best interest to use them in the Olympic Team Event assuming they are recovered and ready to go by then. Their petition definitely should be granted. I don't think it should matter much if the other pairs skate above their usual at Nationals, especially because one could argue that there's less pressure when the top team is missing, and who knows if they would skate differently with K/F there. For example, there has been more than one occasion where it felt like Calalang/Johnson would get affected having to follow a strong K/F skate.
I was really convinced K/F were going to repeat as US champions. They must feel devastated, especially because they took so many precautions and have looked so good leading up to the event. Alexa posted a really strong vid of their LP from a few days ago. If anything, it's good to test positive now instead of before trying to board the plane to Beijing.
The US's selection procedures allow for Knierim/Frazier to be frontrunners for the Olympic team without competing at Nationals. The key stat they are looking at is Median international score
Knierim/Frazier 202.97
Calalang/Johnson 195.98
Cain/Leduc 191.45
Lu/Mitrofanov 190.03
It seems they might calculate the Median with Worlds included (K/F also have an advantage as the top US finisher).
Median score going back to Worlds
Knierim/Frazier 202.33
Calalang/Johnson 195.98
Lu/Mitrofanov 190.03
Cain/LeDuc 189.90
Knierim/Frazier's median score is higher than the 5th place score at 2021 Worlds and consequently should place them alone among US pairs in "Priority Group 2", which is listed as the first method for selecting the Olympic team in USFS's Selection Procedures; the other 3 US pairs are in "Priority Group 3" and then would need further tiebreakers to separate them.
These are all of the US's international scores. K/F's scores are pretty drastically higher than the other pairs, it's really not close.
Knierim/Frazier: 212.55, 205.87, 202.97, 201.69, 186.69
Cain/LeDuc: 202.79, 193.00, 189.90, 170.64
Calalang/Johnson: 197.42, 196.85, 196.69, 195.28, 191.89, 180.49
Lu/Mitrofanov: 195.32, 195.20, 190.03, 186.16, 158.81
There's also a paragraph in the selection procedures that says if the GPF gets canceled (it did), they would maybe take into account 2020 Skate America as well to give these skaters a bigger Body of Work. And K/F won that event convincingly over all the other US pairs.
Aside from scores and the fact that they're nearly undefeated among US pairs throughout their entire partnership so far, K/F just flat out have the best potential to score well. So hopefully Brandon recovers well and the US does the right thing in selecting them. This is the US pair I'm most invested in, and I'd really be crushed if their great momentum as a newer pair gets stalled. They deserve to go to the Olympics.