I doubt any of the callbacks were intentional. JJ Abrams didn’t even know who Plagueis was, and he was mentioned in the movies, and you expect me to believe he knows who Darth Caedus was? These are unintentional callbacks, so of which come from simply being obvious directions to take the story in.
Pretty much the only time JJ has gone on record about the prequels is to say he likes the Darth Plagueis scene.