Honestly, my best guess is that while they try to get back to applicants based upon what group interviewed first, nevertheless, they likely need the student/faculty individuals who interviewed you to be at these meetings on Wednesday in order for you to get a call back. I imagine that there are some interviewers who are busy with XYZ and thus are unable to attend these meetings, prolonging the time to get your decision back. Trying my hardest to remain optimistic about the decision timeframe as you can probably tell hahahahahaha