He was clearly aiming to be first choice prop at Cronulla, losing weight, etc, but I'm guessing that the NRL clubs have gone for faster props this year due to the speeding up of the game. Even Papalii has lost weight (albeit he did it for a boxing match).
It might also rejuvenate David. We have to remember that Big Dave has been stuck here with no chance of going home for quite a while, staring at four walls, getting out just to play in empty stadiums. It might be the tonic they both need.