Two misconceptions are presented in this thread that need to be corrected.

1. It was Luther who, in the doctrine of communicatic ideomatum, upheld the Chalcedon Creed whereas Calvin and his followers divided the person contrary to "the characteristics of each nature being preserved and coming together to form one person and subsistence, not as parted or separated into two persons." Justin Cloute in "Reformed Christology: Modern Nestorianism?" writes,

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Reformed theologians claim agreement with the symbol of Chalcedon, but in reality this agreement is only superficial. "On the basis of the philosophical principle that ‘the finite is not capable of the infinite’ (finitum non est capax infiniti), they insist that the Son of God, after the incarnation, is not everywhere present according to his human nature, but that his presence is limited to a single place." [James R. Janke, "’We (still) do not have the same spirit’ A Critique of Contemporary Reformed Christology and Its Impact on the Doctrine of the Lord’s Supper," We Believe in Jesus Christ, ed. Curtis A. Jahn (Milwaukee: NPH, 1999) p.267] Grudem, an author of a popular Reformed dogmatics book,[Systematic Theology] says, "When we are talking about Jesus’ human nature, we can say he ascended to heaven and is no longer in the world (John 16:28; 17:11; Acts 1:9-11). But with respect to his divine nature, we can say that Jesus is everywhere present."Quotations like this one demonstrate that the Reformed do not hold to the unity of person in Christ as it is found in Scripture and as it was affirmed at Chalcedon. To say that Jesus’ human nature is contained within his human body, but that his divine nature supercedes this body and fills everything, is to say that Jesus’ human nature was not always with his divine nature. This is a separation of Christ.

2. Luther rejected consubstantiation which implies a mix or mixture of two substances. He taught a sacramental union of the undivided body and blood of Christ in, with, and under the bread and wine. Calvin, on the other hand, divided the person, contrary to Chalcedon, and taught that Christ was only spiritually present.