Not really. If we had a pure longevity-based system, you could look at the captains in any given category (assuming the flying was not particularly ugly or great), and cross out the junior 10, 15, or 20% (whatver the company wished to reduce). If T isn't in the bottom of his category, there would be no reason he would need to displace at all, because the distribution of Captains would be close to even across all fleets. Tha's the problem: T wouldn't have to be displaced, and neither would most people.