rD moved to this system a couple years ago: everyone who entered the first time range that doesn't require PoT gets lumped into one giant corrral. It worked really well the first time they did it (happened to be a Dark Side half): I was in F with 6,000 others and they did at least 6 wave starts for F, maybe 7? With plenty of time between each wave, we spread out quickly. It was a bit less efficient for W&D the same year because they did fewer waves and less time between them. It was, IMO, an epic disaster for PHM this year: 10,000 in one corral with no extra waves and short times between waves. So the good news for DS 2018 is that it's "only" 7,000 - hopefully they use at least 6 waves and give us some time to stretch out.