“The divine substance (epiousios) in the Eucharist has no relation to its host which maintains the properties of bread.”
Exactly, as the divine substance of God’s Word has no relation to the paper and ink, which maintain the properties of paper and ink. The bread is the body of Christ, Christ is the Word, and the Word is the bread of life. Those terms are not coincidental or inconsequential, but direct analogs, pointing to the same divine being, Jesus Christ.
Not exactly. Scripture is of God, and that Scripture tells us that the Eucharist IS God.
Peace be with you