Gaga is far and away the frontrunner for Pop Vocal Album. No other releases came close to it as new pop music releases been all flopping.
The only threats I could see in the future is if Harry or Olivia dropped since they seemed to be working on a new album, but seems unlikely they will release in the current elegibility year.
Mayhem is also the runner up for AOTY as Kendrick is an obvious fave. But she will have to work more for it to win, still think it's possible tho.