(Gal 1:8) But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed.
In the above, Paul tells the Galatians that if anyone preaches any other gospel to them, they are to be accursed.
Years later, Peter preached to the Galatians:
(1 Peter 1:1) Peter, an apostle of Jesus Christ, to the strangers scattered throughout Pontus, Galatia, Cappadocia, Asia, and Bithynia,
According to MAD, the epistle of 1 Peter is a different gospel than what Paul preached.
If so, that would mean Peter should have been accursed for preaching a different gospel to the Galatians than the one Paul preached to the Galatians.