UNIVERSITY OF CHICAGO WAITLIST FOR CLASS OF 2019

I thought they have over 3000 on the waiting list?
Edit: called my regional officer (since she never replies to my emails till like a month later) and yes they are going to accept people of the waitlist (she sounded pretty definite, but was avoiding using absolute words)
She also said most offers will still be made after May 1 as only then will they be able to accurately assess the class size and what they need.
So then I asked why I got off. (Literally still in shock, lol, I didn’t even send them anything yet, which also makes me mad because I did have something ready) and she said the very very few students that they already wanted when they reviewed regular applicants but literally did not have space for were offered spots from the waiting list. (Come to think of it I did turn in my application way after the deadline so maybe that’s why?)
So I guess what I said before about my original application is true.
But then I’m also confused, would that “imply” the list is sort of ranked?