Very interesting topic.
I fully agree with Linda. Trying to “visualize” the 2 parties positions and clarify the gaps during a dedicated session can help here. If no solution can be found in such an open discussion (e.g. sometimes it is just not possible to change some key opinion leaders mind-set and opinion since they are not able to cope with the new culture, way of working, strategic directions etc.), it might be required to release such an employee since it might be better for both parties.