Our test results varied from snowpit to snowpit, but the poor structure was consistent. The Thanksgiving crust/facet layer is anywhere from 4-6" thick, with multiple alternating layers of thin crusts and facets. The weakest snow is directly above and below the uppermost crust. For the tests that did propagate (poor stability), the weak layer that was failing was just below the upper crust.
This layer of concern is tricky. It has produced large avalanches at the south end of Turnagain Pass, and in Girdwood. It is also showing poor stability in some snowpits. On the other hand, there are a ton of tracks in steep terrain around the pass, so it is clearly a stubborn layer and maybe not a problem at all locations. There's just not a great way to know which slopes are stable and which ones aren't until you trigger a big avalanche.