Great Tarik!
You are at the point! Excellent post.
What some fellows fail to notice is that we are talking about experienced professionals, with established careers, at this point in time. And for those, seniority is irrelevant.
For instance, a DEC is admitted at airline A for 10,000$ a month. Airline B badly needs experienced captains for their sparkling new big birds, unavailable for the moment.
The only way to fix things? Offer that DEC 12,000; 15,000$ or whatever necessary to compensate the burden of the move...
This is market law fundamentals.