I would prefer to discuss consent of the whole church, what the Bible teaches about being sent, or any of the other issues. I have asked a lot of questions about what consent of the church means
Guess you didn’t read
By What Authority.
What is a “pastor?” The word is from the Latin, in fact, and it means - quite simply - “shepherd.” If you call yourself a pastor, you are claiming to be a shepherd of God’s flock.
The term “pastor” is also interwoven with the biblical term “overseer,” or “elder” - in the Greek, episkopos, or “bishop.” We see this in St. Paul’s farewell discourse to the elders of Ephesus:
“Take heed to yourselves and to all the flock, in which the Holy Spirit has made you overseers, to care for the church of God which he obtained with the blood of his own Son.” (Acts 20:28) There is the connection: the “episkopoi” of the church at Ephesus have guardianship over “the flock” of God’s people.
Further, to be a “pastor” (shepherd, overseer, elder) is also to be an “ambassador” for Christ (c.f. 2 Cor. 5:18ff).
This is no light responsibility, and Scripture tells us that this position is never self-appointed. That is, no man can merely take it upon himself, of his own initiative, to start shepherding God’s flock: “And one does not take the honor upon himself, but he is called by God, just as Aaron was.” (Heb. 5:4)
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the office, because of its solemn duties and grave responsibilities (James 3:1), cannot be taken upon oneself, but rather, one must be called to this office by God.
The same, of course, goes for “ambassadors.” The dictionary defines the word to mean, an “authorized messenger or representative” - thus, an ambassador must be sent. In fact, the word “apostle” is Greek for “sent one.” To this we can add the words of St. Paul, who says that preachers must be “sent.” (Rom. 10:15)
Now, what does “to be sent” mean, except that someone in authority over you has conferred the privilege and authority upon you? In fact, it goes without saying that the one who confers the authority must be superior in authority to the one being commissioned, since no one can confer that which he does not possess himself.
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There can be no other reason why St. Paul would leave his two spiritual “sons” (Ss. Titus and Timothy) explicit instructions about the qualifications for overseers, elders, bishops, etc. (c.f. 1 Tim 3:1-7, Tit. 1:5-9), than that he expects them to confer apostolic authority on new men who meet those requirements.
and directly trying to address who else holds valid apostolic succession.
Since this is a Catholic forum, a distinction needs to be made between “valid” and “licit”. Although we strive to observe both categories, validity is more important than liceity. So, for Holy Orders:
Valid and licit (from a Catholic perspective… the Orthodox generally don’t make the distinction): Catholic, Orthodox, Oriental Orthodox
Valid but illicit: usually, those claiming to have valid Catholic orders although their ordinations were not authorized by the Catholic Church (e.g. Old Catholic, SSPX, independent “Catholic”); a new bishop consecrated when there are fewer than three co-consecrating bishops (though licit with the Pope’s permission, per Canon 1014)
Invalid but licit: can’t think of an example
Invalid and illicit: “ordination” of women