Can one of us lead congregational prayers in the absence of the resident scholar of the center or not? And if not, why? Are we considered unjust believers for selling the pork at our franchise? And if this is the reason, does it apply to someone who is retired from the business?
As for leading congregational prayers, it requires conditions including knowing the rulings of salat, reciting correctly, and most important the state of justice (adalah). Being just means to be committed to the obligatory duties in Islam and abstain from forbidden acts. Therefore, if a small sin is committed the person must hasten his repentance to gain back the state of being just. Thus, being involved in prohibited acts makes the person unqualified to lead prayers unless the person has a valid excuse such as the case in question.