More re: possible Sep HCU(X) changes in the remaining 1.5 weeks of the rollout. When Penguin 4 was released & Google began devaluing links vs penalizing, G released prev Penguin suppression. It was amazing to watch as sites began to surge that were held down. I covered that heavily at the time...

Well, it's totally possible that suppression from the previous HCU classifier could be released (or feel like it's released) if/when more systems are updated. Here's a slide from my 2016 presentation about this. And here's Barry's post from the time about it. Again, stay tuned.