This looks like the same situation that the ppl that are waiting for Drew are experiencing. Its like Geffen and Drew are waiting until after May 15th, when massive amounts of ppl drop, to begin rounds of acceptances.
The recruitment weekend, I thought there were around 90ppl (which includes Drew/Geffen/UCR)...which really isn't that much considering that the full class is 169 total. And I know at least a few ppl that I met whom were planning on withdrawing altogether b/c of another school (i.e. Michigan, SF)...and then there are ppl that might drop UCLA post being pull off of Stanford or UCSF waitlists, etc. (although hopefully not)...and you get that standard domino effect...
So, what I'm saying it that I think you still have a pretty good chance if you are on the waitlist...Good luck! 👍