I think all those players can be good enough, there all proven PL players, with some coaching there’s no reason too think they can’t, look at Newcastle for example, you don’t have to have a complete squad overhaul that would do more damage than good imo. I think Luiz is a class player, and will improve further, my only wish is he gets better at not giving away cheap fouls, because most his fouls are border line but go against them he needs to learn to disguise them better.