This is a real problem on your team and it needs to be fixed, likely from several angles. For Bill, at a minimum he needs an honest conversation regarding his

This is a real problem on your team and it needs to be fixed, likely from several angles. For Bill, at a minimum he needs an honest conversation regarding his impact on the rest of the team. If he's accomplishing his work but dragging everyone else down then he's not really being a net-positive member of the team. Bill needs to understand his impact and either work more, work remotely, or pick some side projects / technical investigations to keep himself busy. If he's that good, then part of his job is teaching and setting and example for others on the team. Second, everyone else on the team needs to know the score. I've found that it's tremendously helpful for junior devs to understand that people on the team are not treated equally. "See Bill? He turns in great work and thus gets to work remotely / leave early / etc. He's been super consistent for a long time. You don't get to do that, because you haven't proven yourself yet. I expect X, Y, and Z from you. If you start turning in super-star work like Bill over a period of time, then you get special consideration too." I've had this conversation a number of times before, and the recipients were always very receptive because now they understand the rules.