Peak Time,
By your logic in sending only the third team you are essentially saying the other teams behind the "blocker" ran poorly and that is why that got beat and thus don't deserve to go. How come it can't be the teams below the blocker ran equal to or better than how they had been running all year when they were getting the at-large points and the "blocker" team simply ran outstanding at the region to beat them. You see this all the time in individual competition where an individual who had been running decently all year but nothing great suddenly pulls off a fantastic race and gets all-american and beats a bunch of guys who had been beating him all year. Those other guys didn't run poorly, the individual just had a great race.