I think you can safely make that assumption because Luiz recently has been making some silly errors. The inclusion of Azpi also made a difference as he rarely lets anyone past him. This is true, the big CL games last season for example, Luiz starred every time he played. It's just this season where he has been trying to do too much, just want him to be as disciplined as he was when RDM took over last season. He played like that for Brazil against Colombia, so there's still hope.