Its probably about the same for DO, but why are you delaying submitting the primary for your MCAT score? Do you already have a low score? Your MCAT score can be updated once it comes in, and as long as you indicate that you will be taking it later, most schools will wait to see the new score.
Unless you already have a low MCAT (<24/25), I would apply to all the schools day 1. If you do have a low MCAT already, I would apply to 1 school so your app gets verified, and then add the remaining schools after your scores come in. You should be doing the same with your AMCAS app as well (most MD schools don't do pre-secondary screens, so its less of an issue).