Truth is truth, wherever it may be found. And there are links all over the place in the saints and among the Churches because of the Apostolic Faith. I'm not saying that Scotus was Orthodox or that the Orthodox are Scotists--just that I see an overlap of truth in both.
Regarding law--Jesus and St. Paul are speaking about the legalism of the Jewish law, but not the divine law, such as the 10 commandments. Jesus himself says, " If ye love me, keep my commandments." (John 14:15), and St. Paul several times enumerates sinners who will not enter the kingdom if they do not repent and keep the moral, divine law --drunkards, fornicators, adulterers, sodomites, etc. This is distinct from the Judaizers which St. Paul had little time for.
Regarding the will... We need God. So we will always have a will--the capacity to freely love God and neighbor.
Now you are walking on thin ice, differentiating between The Ten Commandments and the rest of the Law given to Moses (613 commandments in all; the Jews know them as the mitzvot; they are things they are to do or obstain from doing).
Christ gave us only two of "his" commandments, as they would include all 613 mitzvot.
Don't forget that the entire Torah (aka the Law) is in the Bible. Are you saying that somehow Leviticus is not from God? After all, the Jews and most Evangelicals believe that God dictated to Moses the entire Torah, word by word.
Are you saying parts of the Torah are not true? You never identified yourself as either a Catholic, Anglican or whatever, so I don't know, but I would say that wehatever your denomination is questioning the Bible is not one of its teachings.
Is this your private belief and if so, why don't you state is as such?
I love when a discussion come to this!