Originally Posted by
davetravels
Let's see . . . . In a regular BF gate UG situation, the (supposed) company policy is that the GA has discretion as to whether to to UG someone who has already boarded and sitting in Y, or to UG someone who held back and didn't board yet. Why wouldn't they have the same discretion in this situation, as to leaving an upper level Medallion in the back, vs F seats flying empty?

I think the difference is that the companion coupons specifically state medallian upgrades are not permitted. In the case of pulling people from Y to UG, there seems to be no specific policy (at least in writing). That leaves it to the GA to determine what they want/have time to do without delaying the flight.