If you've worked in tech and have any degree of actual talent, you have run into the following scenario: You are on a team and that team has at least one member that isn't pulling their weight. The reasons why generally range from a lack of work ethic to a lack of talent. Regardless that person can't seem to get themselves fired. Why is that?
Isn’t this your employer’s problem? From your description, it sounds like you’ve collectively isolated Lutz from causing problems for you guys. Has your supervisor asked your opinion?