After the fight all he was talking about was Welterweights he wants to fight next. No talk of moving up in weight. So it seems he's still comfortable at WW.
Brook's boxing job was over after his ego got him into a fight with GGG when his eye socket was fractured. It doesn't take a genius to work out that once an injury like that has happened you're career is effectively over. I suppose his choice was relinquish the belt without a payday fight or actually fight and get paid. I couldn't believe the b/s from nelson, bellow and khan post fight suggesting that Brook could fight on at another weight. Light bulb moment; his career is over due to that eye socket fracture. Any opponent is going for the eye now.