Chris Rosebrough a Biblical Text archaeologist has uncovered what is said to be a fragment of the Apostles' teaching on JBFA. Listen to his report here.
To me the logic of JBFA is very simple by taking key Scriptural declarations - if one confines what Jesus paid for to the ceremonial Law, then that means to say that there are sins that Jesus did not pay for, and to believe that is to deny the testimony of Scripture that says "Behold the Lamb of God who takes away the sins of the world" - John 1:29.
To confine the Law to ceremonial or dietary laws is to commit a fatal blunder for in Romans 3:28
28For we hold that one is justified by faith apart from works of the law.
The law here is singular it stands for the Torah collectively, the whole that encompasses moral, civil, ceremonial and dietary Laws.
Jesus says in Matthew 5:17
"Do not think that I have come to abolish the Law or the Prophets; I have not come to abolish them but to fulfill them".
Not for himself, but for those who do not and are not capable of fulfilling them. Sinners ............like me.