The person everyone works around

Someone on your team is genuinely good. The numbers hold, the hardest client stays, and when something has to be right by Friday you hand it to them. You would not want to run the next quarter without them.

There is a second file on this person that you have never called a file. Two people have asked, carefully, to be moved off their projects. A newer team member has stopped saying anything in the Tuesday meeting. Somebody senior described them to you as a lot, and then changed the subject.

You have been rounding all of that down for about a year, and not because you are weak. You did the arithmetic. Losing them looked more expensive than living with them. Have you counted the whole bill?

You have priced only one side of it

The cost of losing them is easy to total up. The accounts they hold, the things only they know. You could put a figure on it by Thursday.

The cost of keeping them never arrives as a number. It arrives as a colleague who checks their work twice before sending it, or a meeting where the better idea stayed in somebody's notebook because arguing for it was exhausting. Sometimes it arrives as a resignation you filed under personal reasons.

Be specific with yourself. What has this actually cost in the last six months, in people, and in hours you have spent smoothing things over? If you cannot name three things, you may not have a problem. If they come to mind immediately, you have known about this for a while.

Nobody has ever told them plainly

Strong performers often go years without a straight sentence about their effect on other people. The results make the conversation feel unnecessary, then unfair, then risky. Every manager before you gave a soft note about style, watched them shrug, and let it go.

So ask yourself something uncomfortable. If someone stopped this person tomorrow and asked what you want them to change, could they answer? Or would they say their manager once mentioned something about communication?

Being good at the job has not protected them from anything. It has only made everyone around them decide the conversation could wait.

Describe the behaviour, not the person

You cannot ask somebody to have a different temperament, and they will fight you if you try. Abrasive, difficult, not a team player. None of that gives a person anything to do differently on Monday.

Name what happened instead. In Tuesday's review you cut across the same colleague three times, and after the second one they stopped offering anything. When the design came back you called it amateur in front of the people who built it. Specifics can be argued with, which is exactly why they work. They can dispute what you describe, and then the two of you are looking at the same event rather than at each other's character.

Then say the consequence out loud and mean it. Not a hint, not a joke on the way out of the room. If this does not change, it will affect what work comes to you, or whether you stay here. Whichever of those is true, say the true one.

The team is watching the room, not the conversation you had

You will not tell the team about a private conversation, and you should not. They will still decide whether anything happened, and they will decide it from what they see over the next month.

The change has to be visible where the damage was done. If the harm happened in meetings, that is where it has to look different. If somebody was talked over, the repair belongs in the same room, not in a corridor apology that nobody witnesses.

Watch what you have been doing in the meantime. If you have already moved two people off this person's work, you have been managing around them instead of managing them. What has that quiet arrangement cost the people who agreed to it?

You have to be willing to lose them

The test is uncomfortable. If they hear you out, change nothing, and you still cannot picture running the team without them, you were never setting a standard. You were opening a negotiation, and they will work that out before you do.

Plenty of people do change, more than you would expect. Often it turns out nobody had ever been straight with them, and they had noticed being avoided without understanding why. Give that a real chance. Agree a timeframe, then check on it rather than hoping.

If nothing moves, act while it is still your decision to make. A team can survive the loss of a strong performer. What stays with people far longer is the year you knew and did nothing, and what that told them about who the standard is for.