Bottom line is Delta is looking for pilots they believe will be a good fit with the Company and the pilot group. It doesn't matter if one is military, regional, corporate etc. I think the pilot interviewers look at it from the aspect of "can I go out and have a beer with this guy/gal on a layover." Anybody they interview is going to be qualified as far as hours/experience goes. Hence the reason for not bothering with a simulator ride during the hiring process.
Delta doesn't hire First Officers, they hire future Captains. (How one's career actually turns out is another conversation.)
Denny