Well, no. It's more that concentrated strength makes it easier to gerrymander effectively.
Well, specifically in the case of Michigan, community of interest considerations would certainly create the two Black seats and probably Sander Levin's too - though very little else of the state would look anything like it does now.
Really? I'd say all of the following are pretty natural from a "communities of interest" point of view:
- putting the UP district down the more blue-collar eastern half of the LP rather than the summer playgrounds around Traverse City
- a district for the Thumb
- a district for Flint/Saginaw
- an affluent Oakland district - granted, Pontiac is out of place, but Pontiac will be out of place anywhere unless you do a snake up to Flint which would be even more of a GOP gerrymander.
And then there isn't anything obviously disastrous about west Michigan. I agree that the Lansing district and the Ann Arbor/Dingell combination are clearly gerrymandered, but Michigan is going to have more GOP seats than the popular vote would dictate in pretty much any district-based FPTP system unless you give Detroit the fajita treatment.