No, not really. With longevity-based pay, you wouldn't see senior pilots packed in senior categories. They would be more evenly distributed.

If the company had to furlough, the F/O's would already be set to go. The junior Captains forced back down would distribute evenly across the former F/O spots. I'm not even sure they would need to be trained at all. I haven't spoken about the senior-most Captains yet, but these would not all be on one fleet, so they would hang in there, undisturbed, and not making waves for the company. So DAL could take a slow and measured approach to displacing only the junior-most captains, which would be conveniently parked at the bottom of each A category. And since senior pilots wouldn't populate any particular fleet, the loss of one entire fleet, even the most senior, wouldn't even need to be weighed by the company against large displacements either.

You've actually built the perfect cascade-less, flexible, scaleable, shrinkeable airline.

Congratulations.