But it doesn't say anywhere that God counted Matthias as one of the twelve that would rule over the twelve tribes of Israel.
That is simply your ridiculous BIAS preventing your from believing the truth.
Your insistence on Matthias would be one of the rulers over the twelve tribes of Israel is foolish, where keeping an open mind about the possibility of Paul or someone else will take that place is not foolish.
Rubbish... Paul is the apostle of the GENTILES and NOT one of the TWELVE apostles that will with on TWELVE thrones judging the TWELVE tribes of Israel.
If the Bible does not explicitly state something, it is better to be open to alternatives than to insist it is the only possible answer.
There is many things which the Bible does not explicitly state that are still completely true.
Judas was chosen as one of the twelve and was REPLACED per scripture.
Joh 6:70-71 KJV Jesus answered them, Have not I chosen you twelve, and one of you is a devil? (71) He spake of Judas Iscariot the son of Simon: for he it was that should betray him, being one of the twelve.
Judas' replacement from prophetic:
Act 1:15-26 KJV And in those days Peter stood up in the midst of the disciples, and said, (the number of names together were about an hundred and twenty,) (16) Men and brethren, this scripture must needs have been fulfilled, which the Holy Ghost by the mouth of David spake before concerning Judas, which was guide to them that took Jesus. (17) For he was numbered with us, and had obtained part of this ministry. (18) Now this man purchased a field with the reward of iniquity; and falling headlong, he burst asunder in the midst, and all his bowels gushed out. (19) And it was known unto all the dwellers at Jerusalem; insomuch as that field is called in their proper tongue, Aceldama, that is to say, The field of blood. (20) For it is written in the book of Psalms, Let his habitation be desolate, and let no man dwell therein: and his bishoprick let another take. (21) Wherefore of these men which have companied with us all the time that the Lord Jesus went in and out among us, (22) Beginning from the baptism of John, unto that same day that he was taken up from us, must one be ordained to be a witness with us of his resurrection. (23) And they appointed two, Joseph called Barsabas, who was surnamed Justus, and Matthias. (24) And they prayed, and said, Thou, Lord, which knowest the hearts of all men, shew whether of these two thou hast chosen, (25) That he may take part of this ministry and apostleship, from which Judas by transgression fell, that he might go to his own place. (26) And they gave forth their lots; and the lot fell upon Matthias; and he was numbered with the eleven apostles.
All perfectly in order per God's plans. Never any indication of a problem per scripture.