I'm most familiar with the "gate bypass" concept at UA. One major difference, the Red Carpet Lane (=== Breezeway in UA eze) is limited to top FF tiers. This permits use of barriers across the entranceway to minimize "false approaches", but would be impractical in a system like Delta's that's open to all medallions.
I don't know why DL wouldn't use a single ticket scanner between the breezeway and regular lanes with double GA's working the shared scanner, if needed or available. The GA then controls who gets the next access for line up in the jet bridge . This would allow the GA to prevent Medallions jumping other Madallions, or permit the GA to load zones 1 and 2 through the breezeway only if so desired. It also deletes the awkward "reach across" to take BP's from breezeway Medallions.
Got to say that unlike a lot of what I've seen DL roll out recently, this change wasn't adequately communicated or trained on. Probably, the significance of this change was not sufficiently understood.