How should I react as a Scrum Master when in a team of mostly pragmatic people, I have a very detail-oriented "devil's advocate" kind of guy?
The Product Owner is afraid, that the negativity will affect the teams performance over the long run and has correctly stated, that Mr Detail does also gets the least work tasks on the Scrum board done. The project is under high time pressure as we will barely be able to implement the absoult minimum of requirements for our first release at the end of this year.
I can see that the negativity could take some of the teams enthusiasm away and that the others seem to perform better. But I do see some positive effects of his style, too:
While others simply implement a given feature the easiest way possbile, this guy looks if there is a coherent apporach in the system to similar problems and refactors stuff. He also focusses (maybe too much) on good documentation.
The management of the inside customer (where the product owner is from) has stated, that they may want to replace the guy. My management (the internal IT department) definately wants to keep the guy.
Until now I tried to present the advantages of his behavior to the customer while giving him feedback, that he should keep his work as transparent as possible and not work on complex refactorings and quality issues, that are not on the Scrum Board. Therby increasing his visible performance.
I am unsure how his performance really is. I also am not sure, if he adds to diversity and prevents the team from taking a too narrow perspective or is just holding the team back.
I would appreciate your thoughts and suggestions.