He looks shot to me, his life has changed, marriage, kids and financial security, he looks like he has lost a lot of love of the game.I wouldn’t use the term luxury however I would rest him for a couple of matches and put Foden or Silva centre midfield with the hope the rest has done KDB good to recharge his batteries and play him in a deeper role.
Finances apart the life of a top international footballer is tough, 3 games a week, little or no time off and constant travelling, it takes it's toll and with KDB is shows badly.