First, I appreciate the fact that you are not angry towards MAD, and me in particular.
I will attempt to answer your questions here, they are good ones.
Again, I am saying that Jesus taught no Body doctrine. But the
risen Christ did teach Paul all of Body doctrine.
In the years that Paul was taught in the desert, Christ also showed him how things had "changed" too. The Rom 13:9.10 passage that Paul reiterates the very same laws as the other dispensations.
If one understands the Body, its Hope and its doctrine, its laws; then when reading the other Scriptures, it isn't too hard to compare. Also, it seems to me that Paul, as in Rom 13, does set forth the parts of the old Law that would still need obeying. We really needn't do any guesswork. He even states the sins that are the reason that many won't see the Kingdom of God. 1 Cor 6:9.10. So obviously, these are still sins!
Concerning the "communion" that you mentioned. Jesus had been observing the Passover Meal. This is Jewish, and a Jewish Law. The Body is not Jew nor Greek, so we do not follow those ceremonial laws now. Paul talks of a meal together in 1 Cor 11 , as the "Lord's Table". Paul reiterates what Jesus said at the Last Supper (the Passover), using that as explaining the reason why many at Corinth were sick and dieing. They were despising that which Paul "delivered unto them" (Mystery truth) by their actions- their gluttony and disregard for the other saints.
Notice that this was NOT the Passover that they were celebrating- the Passover came but once a year. It was specifically Passover that Jesus was referring to when HE ate that Last Supper with His disciples.
Well, that's it for now,
Pam