I think if Daleman can show readiness in time for worlds, the team should be Chartrand, Daleman, and Cotop (assuming Cotop gets the TES score). Otherwise, Mallet instead of Cotop. If Austman ends up getting the TES minimums (I don't have much faith that she will pull it together to do it in both programs at 4CC, but we'll see), I will be furious if she ends up competing instead of Mallet or Cotop.
I think the best chance to keep two spots is having Daleman there, even if not 100%. Her short program from nationals was very promising. With a few more weeks of training I think she should be more prepared to deliver her free skate.
The key will be to get two skaters to qualify for the free, which would mean one skater needs to make top 12. Or 13th and 14th would do it or 13th and 15th. I think it's doable but not a guarantee.