The sheriff states today that there really was only one "snow cave" - the place where the gear was found sounds more like a belay station with a windbreak cut.
"there was an anchor, with a snow cave - and it's more like a shelter, it wasn't a good snow cave like the first one they built, where the body is. It's another one that they - it's more like a place that they cut out of the snow on a steep hillside, to work from because it had an anchor right there - it had two aluminum snow anchors driven in the snow with some webbing, which only told us that while they were there they put something in the snow so they could clip in and be safe because there's two slings coming off that, which kinda indicates that two people used their carabiners to clip into the rope, for the purpose of just being stable, on a steep slope on the mountain. "
They wouldn't need two pickets to rappel, so maybe one was downclimbing while the other belayed him tied into that anchor. But that doesn't explain where they went, and why they didn't take their pickets.
Perhaps someone who saw the place where they found the gear firsthand can clarify this.