I don't think this is entirely accurate. By May 5th, they will have 300 offers out on the table but that doesn't include the offers which have already been rejected by accepted students. So I'm sure by May 5th, a total of 350-450 students have already been offered in total with 50-150 already declining. I just guestimated on those numbers, but certainly more than 300 total offers have been sent out by that date.
I went into the admissions office today to gather some information regarding what the future holds for us on the waitlist. With regards to the waitlist point system... from reading previous posts, people originally thought that your score is given (from 1 to 3) after the last decision date, but I was told today that you are actually given that score after your interview in the committee meeting which they hold every Monday. I inquired about sending a status update, and their answer made it seem, at least at this point, it is pretty much pointless to give them an update. Your score will not change at this point, nor will they look at the details of your application again. The only way they will look at your application is at the very end of the cycle. Here is how it was explained to me: Lets say if its orientation week and one of the enrolled students didn't show up, the committee will take the next highest score on the waitlist. If there are 4 students all with 2.65s they will then look at each applicant individually to assess who they will accept.