from here
..The second is a theological reason. According to traditional Evangelical theology and Anglican theology in general, a particular church order is not of the “esse” of the Church. It is not a defining mark of what is or is not a visible Church. With this Article 19 of the 39 Articles agrees. So does the language of the Anglican Communion, for the language found in the several Lambeth Conferences of the Anglican Communion refers time and again to the various Christian Bodies as Churches even when they are not ordered under the Historic Episcopate. The language found in Article 1 concerning the Historic Episcopate is not intended to set forth an “esse” position. Even more directly pertinent to the decision before us, since for a body to be a Church it must preach the Gospel faithfully, administer the sacraments of the Gospel in accord with Christ’s institution, and exercise faithful ecclesiastical discipline (see the Homily on Whitsunday) this concern regarding the language about the Historic Episcopate while significant and needing to be resolved need not stop us from forming a Church which bears the marks of a visible Church. Faithfulness to the Proposed Constitution will enable us to be such a Church. In fact, since we will be ordered under the Historic Episcopate we will be such a Church as Anglicans, an Anglican orthodox Church on mission. Being united so basically in the biblical, Apostolic Faith and mission, (look at the list of agreement in Article 1), it is incumbent on us to move ahead with vigor and joy. North American needs us to be such a Church; indeed, the world needs us to be such a Church on mission.
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Bishop Rogers is correct according to Evangelical Theology, bishops may be discarded. It would be a bit more difficult to say what Anglican Theology in general has to say about bishops, as it will depend on what time in the Anglican Church one takes as “Anglican Theology in general.”
If you flip back in the Prayer Book to the Chicago-Lambeth Quadrilateral and Lambeth Conference of 1888, you will find that the historic episcopate is essential to the restoration of unity. Of course, today, the church might well remove “historic” in order to promote inter-communion with other shrinking mainline denominations.
It is also important to remember that the episcopate is the point from which faithful administration of the sacraments flows from Christ to His church by the work of the Holy Spirit. But, I suppose that is Anglican, though not essentially Evangelical Theology.
I would say that the ACNA needs to be a church on mission more than America or the world needs ACNA to be a church on mission. We need a church on mission, but it need not necessarily be the ACNA.