Yes, there were foundational apostles. However, we know there were more apostles in the early church than foundational apostles. If we read the context of 1 Cor 15:8, we know that there were more than the foundational 12 apostles:
3 For what I received I passed on to you as of first importance: that Christ died for our sins according to the Scriptures, 4 that he was buried, that he was raised on the third day according to the Scriptures, 5 and that he appeared to Cephas, and then to the Twelve. 6 After that, he appeared to more than five hundred of the brothers and sisters at the same time, most of whom are still living, though some have fallen asleep. 7 Then he appeared to James, then to all the apostles, 8 and last of all he appeared to me also, as to one abnormally born.
9 For I am the least of the apostles and do not even deserve to be called an apostle, because I persecuted the church of God.
It doesn't say those unnamed apostles were any different from the other apostles. No doubt Barnabas was one of those unnamed apostles, but he was put on a par with Paul (Acts 14:14, 1 Cor 9:5-6 ). One of their essential qualification was they were all eye-witnesses of the risen Lord Jesus, of whom Paul said he was the last. So how can there be any further apostles after Paul? Why wasn't the apostle James replaced like Judas was, when he was killed in Acts 12:1-2?
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