Salem Radio does not syndicate "The Mark Levin Show" - Westwood ONE is the syndicator for "The Mark Levin Show", as well as "The Savage Nation" and other shows. Some Salem owned stations air Levin's show and other non-Salem shows.
Salem’s flagship station brought Mark Levin over from KABC. They can’t very well syndicate him when he’s already contracted with Westwood One. Who he is syndicated with is irrelevant to whether or not Salem wants him as part of their stable.