I grew up in Aspen and was a senior in high school when that happend. I can tell you it was very odd to have a "snow day" on June 8, the last day of school before summer vacation as most of town was evacuated. And, oddly enough, the guy who raised the alarm about the slide threat (Jim Blanning) was the guy who planted a bunch of fire bombs around Aspen this past New Years Eve, evacuating downtown Aspen a second time. Hey rightly offed himself a few hours later.
In any case, when I first saw the Hyak pics, I thought it looked like a typical climax (to the ground) avalanche that we see in Colorado quite often - not a mudslide. And, I don't think this is really a mudslide. But it makes no sense to have a climax avy on a slope like this that ought to be extremely consolidated given grooming and, more importantly, consistent skier traffic - even given the rain. So, while I think this is clearly a climax avy rather than a mudslide, it makes perfect sense that poor runoff management of an unnatural contour played an important role in eliminating the bond between the snow and the ground. We can look forward to seeing this happen on a monumental scale on the Greenland ice shelves.
Given the continued rain, it will be interesting see if similar slides happen on similar in-bounds slopes. If not, probably poor run-off management.
I'd be interested in investigating the crown, but as another poster noted elsewhere ("hangfire"), that could be a pretty perilous investigation better done with a telescope on high ground