I have heard Rush mention Levin on his program a few times, and I’ve also heard him mention stories on The Blaze website.
I don’t see why these guys need to “work together”. I like their individual approaches (Hannity not so much), and I think they all offer something different.
They should “work together” by at least meeting from time to time ensure the hot topics are presented substantially the same way. For example, no amnesty, coordinated attacks on liberals and MSM, etc. But yes, the individualism is good, too, slated in among other topics.