I’d love to see those.
The only one I could find was about them cutting Magus’s storyline out since the whole game, start to finish, tied directly into it, did so from the beginning, and would have required an immense amount of writing for a non-primary character, which is why they gave him a mask.

Masato Kato: To let the cat out of the bag, in the early stages of development, Guile was indeed meant to be Magus. In our original plan, the true identity of Guile was supposed to be Magus after the events in Trigger. (At the end of Trigger, Magus [a.k.a. Janus in Trigger and Magil in Radical Dreamers] disappeared into a Time Gate to go searching for his big sister, Schala, who was lost somewhere in time.) However, as the game’s development progressed and we decided to use such a huge number of playable characters, we decided not to make him be Magus. We thought it was impossible to portray the relationship between Magus and Schala adequately in this game. So we changed tracks, made the colors of the Magus character design paler, and turned him into Guile, the magician. In a way, it’s a pity, as I really would like to have seen the valiant figure of Magus come to life again.

Archived copy of a GamePro interview with Director/Scenario Writer Masato Kato