While we should live holy and righteous lives, we make mistakes. Every person who aspires to leadership in the church will make mistakes and need to repent. It is their lifestyle and their desire to live close to the Lord that should be examined. And since we have mentioned the qualifications of elders and deacons we should remember that all those qualifications are things that all Christians should aspire to and possess, with the exception to marriage and having children. Those are the only qualifications that are singular to elders and deacons.
Leadership just means setting examples.
No one but Christ is in authority in the church. We should understand the difference in original and delegated authority. Jesus has all original authority. No one has the right to give new Scripture or bind new commands. But the Elders have been given delegated authority.