The graph shows Thomas Aquinas as more influential than Duns Scotus. As much as I admire Aquinas, I dispute that.

When I was in seminary, one of the guest lecturers told us of how he was in Rome, doing his dissertation, and he needed to consult a work by Scotus. He went to one of the Vatican libraries and requested the relevant book. He struck up a conversation with the librarian, saying "You must not have a lot of copies of Scotus' work." The librarian disagreed, saying "Oh no. We have more manuscripts of Duns Scotus than we do of St. Thomas."

Except for a brief period during the Council of Trent, the works of St. Thomas Aquinas were almost forgotten from the time shortly after his death until Pope Leo XIII revived his reputation. Graphs like this do not reflect the change in influence over time.