Maybe Failsafe and Cayde-6 fused together somehow while he was trapped with her and she's able to simulate Cayde-6? In all seriousness though, I'd really like to see Uldren as Hunter Vanguard.
Uldren will be shot dead and his ghost exploded with a Thorn bullet before he is EVER considered to even be at the tower. #NotmyVanguard #backinthegravewithyahuldren
I feel like he's in the pit of heresy jamming out to My Chemical Romance and Taking Back Sunday with the lights off.