If I were in charge of TN redistricting I might make a map like this whose primary aim is to punish Scott DesJarlais for being a despicable POS.
https://davesredistricting.org/join/f9d81ce2-a45c-484e-a996-c3d86e97114eDesJarlais is double bunked with Fleischmann in a district that contains all of metro Chattanooga (Fleischmann's home territory) and very little of DesJarlais' rural core. Fleischmann would win this primary easily.
Rose trades away some of suburban/exurban Nashville for the majority of the rural core of DesJarlais' current district.
Rutherford County is placed with Williamson and other counties in a suburban/exurban Nashville district that also contains Green's home. I don't think Williamson County evangelicals would be very fond of DesJarlais' abominable behavior.
The two remaining counties of DesJarlais' current district go to a SW Tennessee district stretching west to Kustoff's stomping grounds in the eastern suburbs of Memphis.
The vacant district is based in Clarksville and rural NW Tennessee, also taking in some Nashville exurbs. This district is as far from DesJarlais' home territory as possible to make it difficult for him to carpetbag into it.
Burchett's and Harshbarger's districts are redrawn as necessary to complete the jigsaw puzzle.
This is a 7-2 map. Drawing a 8-1 map that scuttles DesJarlais' chances like this is harder but I'll give it a try too.