Avoid having your ego so close to your position that when your position falls, your ego goes with it.
Experts often possess more data than judgment.
When we are debating an issue, loyalty means giving me your honest opinion, whether you think I'll like it or not. Disagreement, at this stage, stimulates me. But once a decision has been made, the debate ends. From that point on, loyalty means executing the decision as if it were your own. Leadership is solving problems.