Well, the 12 can be also a certain designation, even when they are f.e. eleven. So could he ment the time after resurraction when he appears in a room where all where gathered except Thomas. And a week later with Thomas.
Matthias was before Jesus gone to heaven, not elected. So he cant be the 12th. Paul mentioned in 1.Kor 15.
And it is not to expect that Judas still was with the other apostles. In eyes of the other apostles he was an enemy.
They would not hide before the jews together with Judas.
So about what we know from the bible, itsould ne obivious that Paul became the 12th. Maby without that the Lord revealed it to him.
So the solution we will get in heaven.
Judas was specifically chosen because he would betray Jesus and lead to the crucifixion jesus chose Judas for a purpose and then replaced him with Paul later for a purpose .
“Jesus answered them, Have not I chosen you twelve, and one of you is a devil? He spake of Judas Iscariot the son of Simon: for he it was that should betray him, being one of the twelve.”
John 6:70-71 KJV
“Now when the even was come,
he sat down with the twelve. And as they did eat, he said, Verily I say unto you, that one of you shall betray me. And they were exceeding sorrowful, and began every one of them to say unto him, Lord, is it I? And he answered and said, He that dippeth his hand with me in the dish, the same shall betray me. The Son of man goeth as it is written of him: but woe unto that man by whom the Son of man is betrayed! it had been good for that man if he had not been born. Then Judas, which betrayed him, answered and said, Master, is it I? He said unto him, Thou hast said.”
Matthew 26:20-25
“Then entered Satan into Judas surnamed Iscariot,
being of the number of the twelve.”
Luke 22:3 KJV
Judas purpose was fulfillment of prophecy
and so was Paul’s this was the intent of Christ selecting Paul who was guilty of the death of Stephen and much persecution to the church beforehand God chose the persecutor and made him the humble apostle And servant who would help reach the world with the gospel even leading the March to the gentile world
“This is a faithful saying, and worthy of all acceptation, that
Christ Jesus came into the world to save sinners; of whom I am chief. Howbeit for this cause I obtained mercy, that in me first Jesus Christ might shew forth all longsuffering, for
a pattern to them which should hereafter believe on him to life everlasting.”
1 Timothy 1:15-16
Paul’s life as a great sinner before he met Jesus and his life after he met Jesus is a powerful witness of Christs goal in the world of saving the sinners who find Christ and repentance
Just as the eleven had seen him after his resurrection Paul also had the experience
After that, he was seen of James;
then of all the apostles. And last of all he was seen of me also, as of one born out of due time.
For
I am the least of the apostles, that am not meet to be called an apostle,
because I persecuted the church of God. But
by the grace of God I am what I am: and his grace which was bestowed upon me was not in vain; but
I laboured more abundantly than they all: yet not I, but the grace of God which was with me.
Therefore
whether it were I or they, so we preach, and so ye believed.”
1 Corinthians 15:7-11
Paul’s appointment was to carry the gospel to the world as the others Matthias the best evidence regarding him is no one ever heard his witness of Christ but the apostle Paul penned about 60 percent of the New Testament
