Interesting thread but fails to address a fundamental question:

Why is first year pay so much less than subsequent years?

The cost liability of initial training and the probationary nature of the first year of employment is universal. The argument to change this must address these two constants and recognize that the CBA pie is only so big. It's up to labor, via contract negotiations, to slice the value of the CBA to benefit the all of the membership.

So far, I haven't seen a strong argument that would convince a labor group to give up gains in a future contract on the current property for a hypothetical gain benefiting a narrow segment of pilot labor that's strictly dependent on cross company/union reciprocity.