You're probably right. I think CDO's had the potential of upsetting the trip mix, but since they came with more credit, they would have enjoyed their own following, and not hurt staffing. My guess is that they would not have been junior, but they might have a had a surprisingly high proportion of sick calls. Hence, Reserves would get punished.

Pretty small rock in our puddle, compared to yanking OE trips before FO awards or forcing the FO being removed to fly a lower trip, as first in the coverage sequence.