text: "So, how do you read 1 Cor, where Paul describes the community's practice of the common meal, it is not clear that it is always led by a bishop."
  
  As I understand it, the great majority of those communal meals did not have either a bishop or a priest presiding.  Luther to the contrary notwithstanding, the Church has taught at least since the Council of Trent that without a priest or bishop, there's no Eucharist.  Without a priest as celebrant, it is a meal in remembrance of Christ, with Christ present in spirit, but not in his real body and blood.  There's no Eucharist, in other words.  This illustrates a major difference between Lutherans and Catholics, and probably a huge barrier to unification of the two religions.