The FCC doesn't consider any sports rights, or number therein, weighted as to requirement of a sale. A station or group having the lions share of local sports teams for a particular market, wouldn't even really be a concern to the SEC. Now if the NFL announced it would be merging with the NBA? That's when the SEC would be in the mix.
Entercom would settle sports rights issues with the DOJ, like they would with certain stations they’re divesting.