Anticipating or preceding the Imam in prayer is forbidden, and if it is done deliberately, it invalidates the prayer. Delaying following him, like preceding him, is not allowed.

If the Imam’s mistakes do not alter the meaning of Al-Fatihah, there is nothing wrong with praying behind him. But if his mistake changes the meaning, then people should not pray behind him if he does not benefit from prompting.

The one who most deserves to lead the prayer is the one who has the most knowledge of the rulings on prayer and has memorized the most Quran.