My understanding of the seven churches...
Ephesus - Messianic - Beginning with the Apostle to the Circumcision, Peter
Smyrna - Martyr - Beginning with the Apostle to the Un-Circumcision, Paul
Pergamos - Orthodoxy formed in this time... Pergos is a tower... Needed in the dark ages
Thyatira - Catholicism formed in this time - The spirit of Jezebel is to control and to dominate.
Sardis - Protestantism formed in this time- A sardius is a gem - elegant yet hard and rigid
Philadelphia - Wesleyism formed in this time - To be sanctioned is to acquire it with love.
Laodicea - Charismatic movement formed in this time - Beginning with DL Moody, the first to make money off of ministry
It appears to me that originally the qualification of a bishop was that he had to be a married man...
A bishop then must be blameless, the husband of one wife, vigilant, sober, of good behaviour, given to hospitality, apt to teach; -
1 Timothy 3:2
So... It appears that the qualifications of bishop changed within what I would call the Pergameon church age and adopted in Catholic churches as well. Therefore, I do not believe that such traditions were handed down by the apostles, but by the Orthodox and Catholic churches. In which, I wonder, if other traditions were handed down as well.
I believe that the Catholic and Orthodox churches tinkered with Christianity, especially within what I would call the Pergameon church age. There are those of us within the Christian church who do not go along with some of the tinkered changes.
But... I believe the Catholic and Orthodox churches will make up the vast majority of the "One Holy Catholic and Apostolic Church" in that last day. There are, simply put though, other Christian congregations outside their fold.