Lets put this way.
Basically, your GPA and Mcat are the foundations of your application, anything else is just icing on the cake, including your shadowing, clinical experiences, LOR and research. If you do not have a good foundation, that is gpa in the 3.5 and Mcat at 510 range, for the minimum DO acceptance, you are just wasting your time to do those medical ECs, including proposed EMT services etc.
Do not look at those published low stats from the schools, some of the low acceptance stats are for URMs, students form impoverished families, non-traditional applicants and significant ties to the school.