With Cumulus, the most likely candidates are, in order: WABC-FM (no need for explanation), Country (Cumulus runs a lot of Country stations and it would be a nice pairing with PLJ), Alternative (Cumulus runs a few of these, as well, expect a more Active direction if they pursue this option). Just my .02.
Country does make some sense for the reason you mention.
CBS Sports Radio makes sense from a "corporate branding" perspective -- getting carriage in Market #1 for the fledgling network...but THREE sports stations on the NYC FM dial? Really? At this point, nothing would surprise me!! But with Cumulus at the helm, you can be sure that whatever they do, it will be on the cheap, cheap, cheap!!