Teams pass through predictable stages, and the difficult middle one is necessary rather than a sign of a bad hire.
This is the coaching-sheet version of a model covered in full at [Tuckman's stages of team development] — forming, storming, norming, performing, and adjourning when the team disbands.
The point worth repeating: a team that never storms has not resolved anything. It has agreed to be pleasant, and the disagreements resurface later as quiet non-cooperation.
Adding one person, changing the leader or changing the goal sends a team back a stage. That is normal and worth saying out loud when it happens, because otherwise it reads as failure.
See the full entry for the detail; examiners want the stage identified from evidence and the leadership response matched to it.