I have a lot to think through before responding to much of this. However, there is a question and a comment I’d like to ask/share:
You said that we can be certain some “gift-positions” have ceased. On what biblical grounds can we have this certainty? And how do you read Ephesians 4:11-16 which says The Messiah has given these gift-positions are for the maturing of the body until Jesus returns?
It seems interesting to me the things you state firmly (things I would say aren’t so firm) and other things a little more loosely. E.g., The plain purpose of such incidents is to testify to the giving of the Spirit of God (each verse you reference, I think would be quite a stretch to say is speaking to the purpose of God pouring out the Holy Spirit) compared to it is perhaps something that happened in other churches (do you really think it was only happening in Corinth? I grant that we don’t know but it is a gift of the Holy Spirit. Do you think teaching perhaps might not have been present in Ephesus?).
I hope that the question/comment come across the right way, especially the latter. I know we are all in this for Jesus.