Well, I'm neither of the people you requested a reply from, but here's how it works. On May 15th you are required to pick a school and drop all your other acceptances. So per your example, yes, you would be "forced" to commit to EVMS. However, if you receive an acceptance from, say, VCU after May 15th, you can accept it. If that happens, you must withdraw from EVMS in a timely fashion so that you aren't holding more than one acceptance. The only thing you lose is the deposit you put down for EVMS, which, being post-May 15th, is non-refundable.
So long story short, having an acceptance pre-May 15th does not exclude you from accepting an offer off the waitlist at another school post-May 15th.
Hope that helps!