Is it really possible to get a 100? (like one of my clients said: “if I’m scoring 100, then I’m certainly doing something wrong”, based on the fact that he is driving change and change is always disruptive).

Yes, it is possible to score 100 even if it is quite unlikely that all team members feels that you are doing all the right things the right way. Obviously, as stated in this question, more unstable times will probably create a situation where your scores become lower. This would be a signal that the teams need in this situation isn’t met and that they can’t fully focus on their job. Therefore, they are not as effective as they could be if these needs would be met, which in turns means you need to act differently as their leader to help them handle the challenges and work more efficiently.

Remember, effective leadership is about creating and maintaining a high performing team. As a leader, you can by definition not be effective in your leadership role if the team is not high performing. In that respect is a single score not as relevant as the trend of scores over time.