Perhaps you will find these Baptist scholars relevant?
Craig L. Blomberg (Baptist)
“Acknowledging Jesus as The Christ illustrates the appropriateness of Simon’s nickname “Peter” (Petros = rock). This is not the first time Simon has been called Peter (cf. John 1:42), but it is certainly the most famous. Jesus’ declaration, “You are Peter”, parallels Peter’s confession, “You are the Christ”, as if to say, “Since you can tell me who I am, I will tell you who you are.” The expression “this rock” almost certainly refers to Peter, following immediately after his name, just as the words following “the Christ” in v. 16 applied to Jesus. The play on words in the Greek between Peter’s name (Petros) and the word “rock” (petra) makes sense only if Peter is the rock and if Jesus is about to explain the significance of this identification.” (The New American Commentary: Matthew, vol. 22 (Nashville: Broadman, 1992), pages 251-252, JPK pages 31-32)
Donald A. Carson (Baptist)
“On the basis of the distinction between ‘petros’ . . . and ‘petra’ . . . , many have attempted to avoid identifying Peter as the rock on which Jesus builds his church. Peter is a mere ‘stone,’ it is alleged; but Jesus himself is the ‘rock’ . . . Others adopt some other distinction . . . Yet if it were not for Protestant reactions against extremes of Roman Catholic interpretation, it is doubtful whether many would have taken ‘rock’ to be anything or anyone other than Peter . . . The Greek makes the distinction between ‘petros’ and ‘petra’ simply because it is trying to preserve the pun, and in Greek the feminine ‘petra’ could not very well serve as a masculine name . . . Had Matthew wanted to say no more than that Peter was a stone in contrast with Jesus the Rock, the more common word would have been ‘lithos’ (‘stone’ of almost any size). Then there would have been no pun - and that is just the point! . . . In this passage Jesus is the builder of the church and it would be a strange mixture of metaphors that also sees him within the same clauses as its foundation . . .” (Expositor’s Bible Commentary, [Grand Rapids, MI: Zondervan, 1984], vol. 8: Matthew, Mark, Luke (Matthew: D.A. Carson), 368)
“The word Peter petros, meaning ‘rock,’ (Gk 4377) is masculine, and in Jesus’ follow-up statement he uses the feminine word petra (Gk 4376). On the basis of this change, many have attempted to avoid identifying Peter as the rock on which Jesus builds his church yet if it were not for Protestant reactions against extremes of Roman Catholic interpretations, it is doubtful whether many would have taken ‘rock’ to be anything or anyone other than Peter.” (Carson, Zondervan NIV Bible Commentary [Zondervan, 1994], volume 2, page 78, as cited in Butler/Dahlgren/Hess, page 18)
Protestant George Salmon, author of The Infallibility of the Church which he wrote to undermine the teachings of the Catholic Church, discusses the matter of metaphorical usage:
“It is undoubtedly the doctrine of Scripture that Christ is the only foundation [of the Church]: “other foundation can no man lay than that is laid, which is Jesus Christ” (1 Cor. 3:11). Yet we must remember that the same metaphor may be used to illustrate different truths, and so, according to circumstances, may have different significations. The same Paul who has called Christ the only foundation, tells his Ephesian converts (2:20):—“Ye are built upon the foundation of the Apostles and Prophets, Jesus Christ himself being the chief cornerstone.” And in like manner we read (Rev. 21:14):—“The wall of the city had twelve foundations, and on them the names of the twelve Apostles of the Lamb.” How is it that there can be no other foundation but Christ, and yet that the Apostles are spoken of as foundations? Plainly, because the metaphor is used with different applications. Christ alone is that foundation, from being joined to which the whole building of the Church derives its unity and stability, and gains strength to defy all the assaults of hell. But, in the same manner as any human institution is said to be founded by those men to whom it owes its origin, so we may call those men the foundation of the Church whom God honoured by using them as His instruments in the establishment of it; who were themselves laid as the first living stones in that holy temple, and on whom the other stones of that temple were laid; for it was on their testimony that others received the truth, so that our faith rests on theirs; and (humanly speaking) it is because they believed that we believe. So, again, in like manner, we are forbidden to call anyone on earth our Father, “for one is our Father which is in heaven.” And yet, in another sense, Paul did not scruple to call himself the spiritual father of those whom he had begotten in the Gospel. You see, then, that the fact that Christ is called the rock, and that on Him the Church is built, is no hindrance to Peter’s also being, in a different sense, called rock, and being said to be the foundation of the Church; so that I consider there is no ground for the fear entertained by some, in ancient and in modern times, that, by applying the words personally to Peter, we should infringe on the honour due to Christ alone.” (George Salmon, The Infallibility of the Church [London: John Murray, 1914], 338-339).