Yes, it was and still is happening on mainline flights. When I list parents and then check the list, they are NOW junior to regional pilots. Just a few months ago when I listed them, they were senior to regionals.
The issue is not between parents and Delta pilots, it is between parents and regional pilots. It is also not a deadhead issue, since deadheads do not show up on the non-rev list, they are positive space. I called the usual numbers and have been told there has been no change to the policy, but when I list them...they are still junior to "OH" "AS" "XJ" "9E" employees etc...