I believe you are making some astute observations. To follow up with your comments about knowledge. The gift is describe in the earlier portion of 1 Cor. 12 in verse 8 where it is coupled with "a word of wisdom." Match that with the fact Paul lists knowledge with two other significant New Covenant gifts, prophecy and tongues and I believe that Paul is discussing a unique spiritual gift synonymous with these two other revelatory gifts. Hence, all three of these gifts had a purpose in the impartation of revelation to the NT Church. Once that purpose was completed, ie, the formation of the Canon and the maturity of the Church to function on earth as the Body of Christ, those gifts ceased their operation. There was no longer a need for them.

Fred

"Ah, sitting - the great leveler of men. From the mightest of pharaohs to the lowest of peasants, who doesn't enjoy a good sit?" M. Burns