It doesn't matter how cheap the gates are at COS. Siegel and Indigo are trying to create some leverage at DIA by talking about other Denver area airports. Think "love field", only smaller.
Oh, and don't think for a second that Siegel worries about displacements. He doesn't care. If there is a lowest cost solution that results in you being based in BFE you will be based in BFE. You don't matter, you're a number.