Accepted applicant. I'm just trying to share what I've observed and learned over several years of obsessing on the process.
IMHO, Drexel's sin is not investing in staff so that they can process applications, conduct interviews, and render decisions in a normal time frame, like pretty much every other MD program in the country does. Having a ton of applicants is no excuse. That just means they have a ton of application fees to throw at the problem.
They don't do the right thing because the "sellers' market" means they don't have to in order to fill their class. The result is that they were still handing out initial As, and then first hitting their WL in mid-late June. As you noted above, they are now bumping up against their CTE date, and then orientation.
This means they don't have time to mess around. As a result, they seem to be prioritizing people who do not have other As, as indicated by the lack of a PTE selection in the CYMS tool. As a result, their yield will approach 100% of people they now accept, which will mean there will not be meaningful subsequent waves of WL movement.
It's unfortunate, because it doesn't have to be this way. They could also work in a normal timeline, which would allow for more traditional WL movement, which would, as you speculated above, give more people the opportunity to attend a more preferred school. As the end of the day, though, you will still be a MD, and most people come to love whichever school they end up attending.