Part of the problem with the ranking (which I wasn't aware of until recently) is that the same two people do the ranking for all of the selective admissions programs at Macomb. So there are only two people entering in all of the info, sending out the first round of letters, dealing with any discrepancies and then doing the ranking. I would imagine that's why the letters for acceptance into the different programs are staggered.
Although, given that, I'm not sure why they all have the same due date. Wouldn't it be less stress for the ladies doing the ranking (& the people in the enrollment office for that matter) and the students if they staggered those instead?