Michigan - Dingell lost Monroe County - this could be transferred to the 7th. Levin won the Macomb portion of the 12th, but by a smaller margin than Dingell carried the Washtenaw portion of the 15th. So the 10th gets a bigger chunk of Macomb, and then a Detroit area seat is eliminated.
The 9th was close so it could be better to shift some territory from the 9th to the 8th or the 10th.
The 12th will likely disappear, and feed territory to the neighboring Dem districts.
That means yielding the 9th, but that’s fine. 9-5 is a fair lead in a state like Michigan.