I think I am in a similar spot, by virtue of taking so long to submit my acceptance paperwork. Based on all the messages about the EL waitlist, I have to assume it's long. Maybe you know this already,
"While you always have the option of deferring your admission to the next year, you will not be allowed to request a specific site or carry forward your site assignment to the subsequent year. Numbers of openings and allocation methodology for deferred admissions will be determined each September." (from the website)
In that case it seems like it may not be worth the chance to defer to get EL. After all, you'd only spend 2 years at DMC or Macomb anyway...