Peter & John always seemed to have this competition between them.
When Yeshua was asking Peter do you love me? I believe Peter was also thinking about John and how much He loved Yeshua and why Yeshua wasn't asking him to lead. In John ch 21:20, John was behind them, following them. Peter asked about John and Yeshua said to Peter “If I want him to remain until I come, what is that to you? You follow Me!”
Yeshua did not give full revelation to Peter about John life. He also did this with other knowledge. When Peter spoke of the end-times, he did it with a general sense of what he knew from the Tanach. Peter didn't have that revelation that John was given. Remember they only had the Tanach and what Abba would reveal to them. We each have a different understanding and knowledge of Him. We see this with Peter and Paul disagreeing about the jews & gentiles. They were both mature in Him but Peter didn't have that understanding from the Spirit about that area. He knew they are not unclean but used His interpretation about them.
So what are we to do? To seek Abba by His Spirit in all things. We all have different aspect of Abba. He created us that way so we can come together just like a puzzle creating a more complete picture of Him and using love as the glue. We cannot do this on our own accord. We must hear Him, be intimate and talk with him. People who try to explain Abba without hearing Abba, are only using only their own interpretation & knowledge. They will miss the mark because they did not seek The Spirit. Yeshua said in Luke 24:49 "And behold, I am sending forth the promise of My Father upon you; but you are to stay in the city until you are clothed with power from on high.” We need to stop using man's knowledge and start hearing His Spirit, coming together as one becoming Yeshua's bride.
2 Peter 1:3-4, 20-21 "God’s power has given us everything we need for life and godliness, through our knowing the One who called us to his own glory and goodness. By these he has given us valuable and superlatively great promises, so that through them you might come to share in God’s nature and escape the corruption which evil desires have brought into the world. First of all, understand this: no prophecy of Scripture is to be interpreted by an individual on his own; for never has a prophecy come as a result of human willing — on the contrary, people moved by the Ruach HaKodesh spoke a message from God."