Do you question that the Disciples could have consumed the true body and blood of Christ before His cruciifixtion because He couldn't exist in more than one form at one time?
No, I question it because the eating of blood is strictly forbidden in Scripture by God and that is one of the few commands reiterated in the Council of Jerusalem to non-Jewish believers.
I question it because in Acts 10 Peter himself said that he had never eaten anything unclean and partaking of blood would have made him unclean for the Passover.
Furthermore, Jesus could not have eaten blood as that would have rendered Him ineligible to be the spotless lamb of God, the perfect sinless sacrifice as eating blood broke the Law, which He never did. He came to fulfill the Law, not to break it. If the cup He partook of was blood, He would have defiled Himself.
Not to mention that He called the cup *the fruit of the vine* in Matthew 26, Mark 14, and Luke 22.