All of this is academic at best... CLEARLY, maintaining a single fleet is best for all- but we pilots just don’t know....

As for the rest- seniority is seniority... if a new type comes to a desirable base, AND happens to have desirable schedules- guess what?? The new type will go senior- right up until the point that it looks like not-so-desirable....

These are moving targets- that will probably continue to move.... IF it even happens....