Then I don't know how else to explain it. Sports is a lifestyle/demographic buy, not ratings-based like music stations. And I'm not the only saying that. You're treating 6+ ratings like winners and losers on a scoreboard. It doesn't work that way.
Then by your time litmus test, KJR should not have been a sports station for almost thirty years, because their 6+ ratings have never been much, let alone made the commitment to move over to 93.3FM
Having been directly involved during team negotiations for broadcast rights, stations take their best financial shot, but nothing is guaranteed. KJR being a full market FM signal, gives them a distinct advantage over AM.
They've made the decision. There's no going back now. Even if they get one major local sport, it's all worth it.