Your guess is as good as mine as to what Alan and Joanna Usher will do with the current NRG cluster in Omaha. I will, however, say that one normally wouldn't expect to see a hip-hop station in Grand Island, NE. So, no one should be surprised that it's not a format they, or their family, have done. In other words, I don't think you can read any tea leaves from what they're doing in Grand Island and Scottsbluff as they're just not Omaha and don't have similar demographics. I don't think NRG has an urban station anywhere else either.
Keep-in-mind that Omaha is roughly 10% African-American, and hip-hop tends to get an audience that's between 1/3 and 60% white. It has the numbers support an urban station if it has the business clientele willing to support it and if Usher Broadcasting will put in the work required to sell it. Hip-hop can be a tough sell, but, if it's making money for NRG, there's no reason it can't for Usher, too.