Don Johnson

On leadership ministries being gifts

Eph 4:11
Eph 4:12
with a view to the perfecting of the saints for the work of the ministry, for the building up of the body of Christ,

On Paul confirming his message
Gal 2:2I went up because of a revelation and set before them (though privately before those who seemed influential) the gospel that I proclaim among the Gentiles, in order to make sure I was not running or had not run in vain.
Gal 2:6
And from those who seemed to be influential (what they were makes no difference to me; God shows no partiality)–those, I say, who seemed influential added nothing to me.
Gal 2:7
On the contrary, when they saw that I had been entrusted with the gospel to the uncircumcised, just as Peter had been entrusted with the gospel to the circumcised
Gal 2:8
(for he who worked through Peter for his apostolic ministry to the circumcised worked also through me for mine to the Gentiles),
Gal 2:9and when James and Cephas and John, who seemed to be pillars, perceived the grace that was given to me, they gave the right hand of fellowship to Barnabas and me, that we should go to the Gentiles and they to the circumcised.

This is the leaders of the Jerusalem church confirming Paul’s message.
Paul wrote Scripture, so signs and wonders help confirm him as speaking for God as God did things thru him.  If anyone today would claim to write Scripture, I would expect similar signs and wonders as part of the confirmation.
On Acts

Act 1:21
So one of the men who have accompanied us during all the time that the Lord Jesus went in and out among us,
Act 1:22
beginning from the baptism of John until the day when he was taken up from us–one of these men must become with us a witness to his resurrection.”

you say that one of the marks of the 12 is being a witness to the resurrection and quote this verse, but you do not accept the other qualification, being with Jesus from the baptism of John.  This was not very many people, so 2 possibles does not seem impossible.  And Paul is not one of them.

Ephesians 2:11 And indeed He gave some to be apostles; and some prophets; and some evangelists; and some pastors and teachers;