I don't think this is the right way to look at it. Given that they have to give out many more acceptances than seats (probably in the range of 150-200 for a class of 125), and there are only 80 members in the group, even if there are members who aren't in the Facebook group (let's say 5-10), there are still many more acceptances to be given out--around half, if my numbers are anywhere in the correct ballpark!
I'd like to reiterate that the majority of seats (anywhere between 2/3-3/4) are handed out in March, which means that Dr. Chan has many calls to make today, tomorrow, and Friday. He spent ~5 minutes on the phone with me, so multiply that by 80, and that's a little under 7 hours of phone calls.
Last point: there is a lot of movement off the waitlist at the U. It doesn't matter how or when you get in once you're in!
Wishing you all the absolute best and fingers crossed for you