Its pretty simple. When Delta, or any company for that matter, hand picks a resume to interview a candidate, they really want to hire that candidate because on paper, they meet all of the requirements and have chosen that specific candidate for an interview. With Endeavor's guaranteed interview, they don't get that chance. They are basically being forced to interview someone without choosing to do so. Given this dynamic, there may be a stricter standard, you may have to "wow" them a bit more to get through the gate. This is not to say that Endeavor pilots are any less qualified that off the street candidates, as a matter of fact, the great majority of pilots at 9E are excellent candidates for Delta. Its just that 9E pilots have not been "selected" for an interview and I think that makes a difference in the outcome.