Has there been any scuttlebutt about McMahon being available? Not sure why Colorado would look to deal him, unless you offer a starter they really, really like. I wouldn't feel comfortable including Gasser, but feel that might be what it takes. He DOES fit the roster pretty well, although I hate the K rate.
At the end of the day, what I suspect it would take to pry him loose is probably too rich for my blood.