You can thank the Mesaba ramp for your problems... This issue has been ongoing for a long time and from what I have heard there has been no progress on "fixing" the ramper park/push issues and the gate agents feel they have "authority". Last week in DTW I had a gate agent who INSISTED she could board when we had a 2+ hour ground stop (we were trying to go the the east coast in a winter storm) and my FA went to get food, my CA was down in ops and I had to escort the folks BACK up to the top of the jetbridge, tell the gate agent AGAIN not to board, then argue with her when she started raising her voice in the middle of the gate area telling me "you don't know what you are doing". I about choked a b!tch. Ultimately I won.
Your issues with DTW is not new to anyone, and FAR from pinnacle's fault. We are the red tailed stepchild.