I think it was very stupid to do the Birkie (when WC overall the big prize, but to be fair to Diggins Kershaw had a very good explanation as to why it on a personal level made a lot of sense for Diggins to do the Birkie) and thats the main reason she was very bad in Lahti and lost a lot of points there.
Then I think it’s hard to read to much into her form since Lahti. Classic sprints in Drammen and Falun are hard for the type of skier she is. Good results in these for a skier with the profile of Diggins are maybe more dependable on the skis and how the heats are being raced and the positioning than form.
With questionable form and difficult conditions it can really go both ways today.