What is the ruling on a man who shaves his beard and lets his garment hang below the ankles leading the prayer, if he is the one who knows the Qur'an best?

What if the one who knows the Qur'an best among the people is one who shaves his beard or lets his garment hang below the ankles?
There is a barrier in this case. If there is a barrier that prevents it, it prevents. The intention is if they are all sound. But if there is a barrier, such as a disbeliever, he does not lead. As for sin and religious innovation, the one who follows the Sunnah is preferred over him, as well as the one who covers his 'awrah and the one who does good.