As to the binding and loosening --- in Matthew 18 it is Christ who again raises the same issue, pointing out that it is He that is doing so -- while addressing them all as to having (or will have) this very same binding and loosening.
I'm sorry, but your own twisted eisegesis may suit what developed later in Rome (alone) as to singular papacy and that particular branch of the church's own preferred opinions of itself (and the "horrific implications of that) but the earliest church, even in Rome, didn't quite see it the same way.
What about it? It teaches that the Eucharist does not "profit" the stomach. And indeed it doesn't. That finishes the contrast to the Manna, which only fed the stomach. This does not say anything about the nature of the Eucharist itself.
Yes, binding and loosing was later given the entire Catholic Church.