The programs haven't officially merged they are only moving closer. If they offered 12 RU's to CO, the merged carrier would likely have to offer 12 without causing an uproar. By offering CO elites 4 it places them in a strategic position to offer anywhere between 4-12 once it is one program.
CO elites are getting short changed on numerous levels and UA elites are getting short changed on numerous levels
...such is reality in this lovely merger