Note the Dallas market has a WFAA television station. That begins with a W. It got the call sign in 1950 when it became a sister station to WFAA 570 AM. The TV station signed on as KBTV in 1949 but was sold the next year.
Any AM, FM or TV station with an unusual call sign can share it with its sister stations on the other bands, even if it breaks current rules for stand alone stations. CBS was able to set up WJZ-FM Baltimore, WBZ-FM Boston, KDKA-FM Pittsburgh and WIP-FM Philadelphia in the 2010s, even though those call letters all broke rules that would apply to stand-alone FM stations.
When WFAA radio became KLIF in 1983, that allowed the TV station to drop the "-TV" suffix from its call sign. And from 2010 to 2013, an FM station at 96.7 simulcast WBAP 820. So that was also WBAP-FM for three years.
There are now eight stations in Texas with W call letters:
--WOAI-AM-TV San Antonio
--WTAW (AM) College Station
--WTAW-FM Buffalo
--WACO (FM) Waco
--WFAA (TV) Dallas
--WBAP (AM) Fort Worth
--WBAP-FM Haltom City (soon)
There's no need to park KLIF-FM. Cumulus still has KLIF (AM). Another company can't claim KLIF-FM without Cumulus' permission.