Both Nix and Daniels are looking very similar to Caleb and Daniels has been losing games for Washington with the turnovers in the last two games. Nix lost a 4th quarter comeback to the Chiefs on a similar play that Williams did to the Packers. It hasn't really been on Williams it is the HC and not Williams that is the problem for the Bears.
Not sure what you were watching but Caleb played really well in the 2nd half. The Bears have been absolutely awful in the 1st half other than against the Jaguars, Packers and Panthers. The Packers game was the first time the Bears had a 1st half lead since the Jaguars game in October. This is a HC problem and not a QB problem. Caleb needs to work on some things but when he is not holding onto the ball for a long time he has looked really good. He hasn't thrown an INT since 10/13 I am not sure why you think he is not looking as good as Nix or Daniels. He has been looking really good since Brown has taken over at OC for the Bears.