Many good pastors do get fired. They can thrive in a new church.
Peter denied Jesus three times. He regretted it greatly.
John Mark deserted Paul and Barnabas. Barnabas wanted to give him another chance. Paul didn't. It was painful (Acts 15:37-41). Mark appears later in the NT positively.
1. Some emphasize grace to themselves and others.
2. Others deny everything.
3. Others stress how they been radically transformed and enlightened.
Most market themselves extensively.