Placed inside the Ark vs. Placed on side of Ark
This argument would be valid except for the fact that the 10 commandments were actually written twice by Moses in the book of the law. Since the Ten Commandments were also written by the hand of Moses in both Exodus 20 and Deuteronomy 5 it is more accurate to say that both the Torah and copies of the Ten Commandments were placed beside the ark, but only the 10 commandments were in the ark.
The 10 commandments were actually located in two places: both “inside” and “on the side of” the Ark of the Covenant. The fact that the 10 commandments were the only law placed inside the ark, actually proves they were the core of the Old Covenant. We are no longer under the Old Covenant, since we now live under the New Covenant Law of Christ!