A lot of misinformation in this thread. Which is better? Both. Neither. DMU and PCOM are among the best in the nation so either will provide you with awesome opportunities.
As far as faculty turnover, couple getting a new president and dean with the opening of a ton of osteo schools unfortunately left a lot of openings. New faculty are coming in, yes. As to them being iffy, all of that is subjective. Personally, i think they are much better than most of the people who left. By far. One professor in particular who left was loved by many and I was told that they were one of the best professors DMU had is it was horrible they were leaving. I got to have them and couldn't stand their teaching style. I thought they were horrible. Most of the new people are incredible and some suck. Some of the old people are incredible and some suck. Ultimately, there is no difference. My personal preference, having seen both many of the old and the new, I would take the new profs. But again, this is subjective. In addition, we have a new dean who is in-friggin-credible. For the lack of a better term, he is amazeballs. As for non-clinicians not teaching clinical med, i have no clue what you are talking about. Maybe you are eluding to the fact that experienced PAs are now teaching some of the basics, which is true. But if you are telling me that a PA with decades of experience can't teach a 1st year how to use a stethoscope, then go to PCOM because that is just arrogance. And clinical med is all first year which teaches you how to do the basics. All second year is taught by clinicians telling you how to do the specifics.
As for a 4th year teaching, yes. This is true. DMU has a "educational scholars" pathway which is basically like a medical education concentration. It is competitive, you have to prove you are qualified for it, but it teaches you the basics to become a medical educator. Part of this is teaching a couple classes. She taught us second years a couple classes as well. It isn't because they are short on good staff. It is because they offer an incredible opportunity if you want it.
All in all, both schools will provide you an excellent education. Neither better than the other for all practical purposes. PCOM may have more associated residencies. Could be important. But DMU has many year long third year rotation sites in michigan and ohio with a ton of residencies. Both schools will have problems. Both will have benefits. If you feel more comfortable at DMU but you are afraid of leaving PCOM due to opportunities, go to DMU. If you feel more comfortable at PCOM but you are afraid of leaving DMU due to opportunities, go to PCOM.