I'm all for the 747's being paid the highest as long as there aren't any fences around them.
What that letter doesn't address is that the UAL MEC passed a resolution mandating that it pay the highest, not the other way around. As far as I know the joint NC came up with an agreed upon section 3 and the UAL MEC shot it down, not CAL's.
Facts are a tricky thing as my buddy Coto likes to point out.