Please explain St. Peter vs. Jesus as cornerstone.

In Matt. 16:18 it is clear that Jesus is confirming Peter as the cornerstone of the Church. However in these quotations (1 Cor. 3:11, Eph. 2:20, 1 Pet. 2:5–6) it appears that Jesus is the foundation or cornerstone. Please explain.:confused:

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Recommended Reading:
*]Peter and the Papacy
*]Peter’s Authority
*]Peter the Rock
*]Peter’s Successors

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