The sacramental ministry is not the same as preaching/homiletics. Pastoral guidance seems to be analogous to spiritual direction.
Both the sacramental ministry and preaching are important, as is the role of a good spiritual director. For us these can be one person capable of all three, or two/three separate persons.
The concept of Apostolic succession relates to the bishop primarily, he is the ultimate pastor and he ‘delegates’ his sacramental and service functionality to others when he accepts them as his priests, deacons, subdeacons, readers etc.
The question then, should be ‘what makes a good bishop?’
This saying is trustworthy: whoever aspires to the office of bishop desires a noble task. Therefore, a bishop must be irreproachable, married only once, temperate, self-controlled, decent, hospitable, able to teach, not a drunkard, not aggressive, but gentle, not contentious, not a lover of money.
He must manage his own household well, keeping his children under control with perfect dignity; for if a man does not know how to manage his own household, how can he take care of the church of God?
He should not be a recent convert, so that he may not become conceited and thus incur the devil’s punishment.
He must also have a good reputation among outsiders, so that he may not fall into disgrace, the devil’s trap. Similarly, deacons must be dignified, not deceitful, not addicted to drink, not greedy for sordid gain, holding fast to the mystery of the faith with a clear conscience.
Moreover, they should be tested first; then, if there is nothing against them, let them serve as deacons.
1 Tim 3:1 - 10
Therefore, appoint for yourselves bishops and deacons worthy of the Lord, men meek, and not lovers of money, and truthful and proven; for they also render to you the service of prophets and teachers. Despise them not therefore, for they are your honoured ones, together with the prophets and teachers. …
Didache Chapter 15
"Take care to do all things in harmony with God, with the bishop presiding in the place of God, and with the presbyters in the place of the council of the apostles, and with the deacons, who are most dear to me, entrusted with the business of Jesus Christ, who was with the Father from the beginning and is at last made manifest *… "
*Saint Ignatios Letter to the Magnesians
Wherever the bishop appears, there let the people be; as wherever Jesus Christ is, there is the catholic (καθολικός) church. It is not lawful to baptize or give communion without the consent of the bishop.
On the other hand, whatever has his approval is pleasing to God. Thus, whatever is done will be safe and valid.
Saint Ignatios Letter to the Smyrnaeans