Yes that's right, except for the fact that June 24th is just MUSC's deadline. It is school-specific what actual date you have to select "Commit to Enroll". Ideally and probably in practice most people make their final decisions before that. There are also a number of deadlines that will help facilitate waitlist movement besides just Commit. One example is that MUSC requires accepted students to limit their acceptances to one on May 2nd. Another example is that the last day to have the deposit to secure your seat fully refunded is May 15. For a school like Downstate, the deposit is "only" $100, whereas at MUSC it's $450. So these types of deadlines should also cause shifting. So annoyingly complicated!!