Is the prayer valid if led by a 16-year-old, despite the presence of someone more qualified? What is the Maliki school's view on a congregation that finds the regular imam has finished praying, so they put someone else forward and pray? Is it permissible to put forward a disabled person to lead the congregation in prayer?

As for the first question, its answer is: The imamate (leadership in prayer) of a young, mature male is valid if he has reached the age of fifteen. The general rule is that whoever's prayer is valid for himself, his imamate is valid for others. However, it is preferable to put forward the one who is most deserving of leading the prayer, according to the Prophet, peace be upon him: "The people should be led in prayer by the one among them who is the most knowledgeable of the Book of Allah..."

As for the second question, its answer is: What the group did is disliked (makrooh) according to the Maliki, Shafi'i, and Hanafi schools of thought, and it is the preferred view (rajih) among the Hanbalis. The details of this are that a second congregation in the same mosque is disliked due to the potential for animosity among the imams.

As for the third question, its answer is: The imamate of a person with a disability in his leg is permissible without being disliked, according to the preferred view among the Malikis, while it is disliked among the Hanafis.