Passing by John 18:15,16, where "the other disciple" is probably the author, and ch. 19:26,27, where the repetition of the strange designation, "the disciple ... whom he [Jesus] loved," confirms the impressions derived from ch. 13:21-25, we discover another important indication in ch. 19:35. "And he that hath seen hath borne witness, and his witness is true: and he knoweth that he saith true, that ye also may believe." "He that hath seen" can scarcely refer to anyone other than the beloved disciple who was mentioned just before as standing by the cross. In the present verse, this beloved disciple is represented as the one who is now speaking. The identification of the beloved disciple with the author of the Gospel, which was implied before, here becomes explicit.
In John 20:1-10, "the other disciple whom Jesus loved" is of course the same as the one who appears in ch. 13:21-25; 19:26,27,35.
=(5) Testimony of the Appendix.=--In John 21:7,20-23, the beloved disciple appears again, and in v. 24 he is identified, in so many words, with the writer of the Gospel. In this verse the first person plural is used; other persons seem to be associated with the author in commending the Gospel to the attention of the Church. This phenomenon is explained if the twenty-first chapter be regarded as a sort of appendix, perhaps added at the request of a circle of friends. It will be observed that ch. 20:30,31 forms a fit ending to the book; what follows therefore appears the more like an appendix, though it was certainly written by the author's own hand and published before his death along with the rest of the book.
=(6) Why Are John and James Not Mentioned by Name?=--The conclusion of our investigation is that the author of the Fourth Gospel indicates clearly that he was either one or the other of the two sons of Zebedee. This conclusion is confirmed by the curious circumstance that neither one of these men is mentioned in the Gospel by name. How did they come to be omitted? They were in the very innermost circle of Jesus' disciples; many apostles far less prominent than they are named frequently on the pages of the Gospel. There can be only one solution of the problem: one at least of these men is, as a matter of fact, introduced in the Gospel as the beloved disciple, and the reason why he is introduced in such a curiously anonymous way and why his brother also is not named, is that the author felt a natural delicacy about introducing his own and his brother's name into a narrative of the Lord's life.