Grammatically (Greek grammar) Matt 16 does not identify Peter as the "rock".
Courtesy ChatGPT
Formal Syllogism (Grammatical Argument)
Major Premise:
If Jesus intended Peter himself to be the foundational “rock” in Matthew 16:18, the Greek text would naturally use a construction that directly identifies Peter as the referent (e.g., “upon you” [ἐπὶ σοὶ], “upon this Peter” [ἐπὶ τούτῳ τῷ Πέτρῳ], or “you are the rock” [σὺ εἶ ἡ πέτρα]).
Minor Premise:
The Greek text instead distinguishes between Πέτρος (a masculine proper name) and πέτρα (a feminine common noun), and introduces a demonstrative phrase (“upon this rock,” ἐπὶ ταύτῃ τῇ πέτρᾳ) that most naturally points back to the immediately preceding divinely revealed confession (v.16–17), not to Peter’s person; moreover, none of the direct-identification constructions appear in the text.
Conclusion:
Therefore, grammatically and syntactically, Matthew 16:18 does not identify Peter personally as the “rock,” but rather identifies the revealed confession that Jesus is “the Christ, the Son of the living God” as the foundational referent.