I'm making the point that the Apostles, and not only the Apostles, governed churches that they were not local members or pastors of. Today, any denomination trying to emulate that would have an episcopal structure. In fact, the Bible does use the term episcopal/bishop for overseers, of which the Apostles functioned.
In the first case you gave, Acts 6, I would say that the Apostles probably were members of that local church. However, the apostles did exercise outsized authority not present in any office in the church today. Yet, in the case of Acts 6, it is shown that the apostles exercised the authority of choosing deacons in conjunction with the consent of the congregation (they chose). With that example, I see no reason to assume there is no consent of the congregation in the other instances; the wording doesn't exclude it.
The Bible teaches that there were bishops over the churches. The bishops appointed a plurality of elders at each church and the local churches appointed deacons.
The biblical usage supplies evidence for synonymous usage of bishop, elder, and pastor. In Titus 1, Paul speaks of Titus’s purpose in Crete to ordain elders, then begins to speak of their qualifications prefaced with the word “bishop.” The “for a bishop” beginning of verse 7 indicates it connects back to the idea of elders in verse 5. They are connected. They are synonymous. Bishops are elders.
In 1 Peter 5:1-3, Peter exhorts the elders in these places. To the elders he exhorts, Peter says these elders are to “bishop” (ἐπισκοποῦντες) and “pastor” (ποιμάνατε) the flock/church of God. Incorporated in the duties of the elders are found, in verb form, the names of the other interchangeable terms – bishop & pastor,
episkopountes &
poimavate.
Paul calls the plural elders of the church at Ephesus to meet him in Miletus. In charging the elders, he calls them “overseers” (bishops; ἐπισκόπους) who are to “pastor” (ποιμαίνειν) the church/flock of God. In this case, the noun form of
episkopos is used directly, and again the pastoring is embedded in the verb form of feeding (
poimainein) the flock.
In addition to the synonymous usage of the terms bishop, elder, and pastor, the collective and harmonious nature of the three terms may be deduced from the scriptural qualifications for office. 1 Timothy 3:1-7 details the qualifications for the office of bishop – “A bishop then must be…” Comparing 1 Timothy 3:1-7 to Titus 1:5-9 demonstrates that the office of bishop and elder are the same office in qualifications, with two nominal descriptors. The Bible contains no separate and distinct qualifications for another office, except that of deacons, signifying that pastor is not a distinct office with separate qualifications from the bishop/elder.
Every church is ruled by elders or bishops. I've never known a church ruled by the congregation, beyond voting for elders. If there is one, the congregation would spend an hour or more each week after the service talking business.
First, that means the churches you have known is limited. I know churches who vote on most everything, and that end of the spectrum can get out of hand too. Second, we don't decide faith and practice based on our experience. Third, if a congregation can install and remove elders, they ultimately are ruling, even if they leave the ordinary details up the the elders.