The theories of different saints, when added to the magisterium, only add to the core knowledge that was already there.
If they aren’t adding to the core knowledge, then they are just theories.
All Anselm’s theory did was to draw from the nuances of language surrounding “satisfaction” and interpret it in a legalistic fashion.
Do keep in mind that he was, in fact, appealing to a very legalistic society trying to help them comprehend the crucifixion in their own terms. It doesn’t mean that what he theorized didn’t exist beforehand, it just wasn’t understood by the society that way. But no society before Anselm’s would have understood the way legalism was being used during that time.
Remeber, after Anselm, St. Thomas continued to finalize this theory as it pertained to culture at the time. Yet before that, the theory still had fullness based on the understanding of the midset of people at the time.
What you are trying to imply would be akin to someone in 200 years saying that people 500 years ago didn’t understand the Trinity because they didn’t have fidget spinners to compare.