Excuse me but I am afraid you are mistaken. The only way a merger between CO and UA won't happen is if DL and NW do not merge. As has been reported, the UA/CO merger hinges on the DL/NW merger. If DL does not merge with NW, then UA and DL will proceed with a merger, leaving LCC with no one to dance with again. And if DL and UA merge, then CO will either pursue NW or possibly AA as a defensive move.
For the 1,000,000th time... If UA and LCC were going to merge it would have happened by now. No one wants to touch LCC with a 10 foot pole due to the current problems on their property and the fact that they bring very little to the table that the legacies are interested in.