Gaspar always had the best robes of all the Gurus. He would have made a fascinating addition to the game. I think, however, that the decision to cut him was apt. Chrono Trigger was too "bright" to include a character like that in the playable cast. He'd have been much more at home as the fourth member in Radical Dreamers, or the millionth member of the Chrono Cross playable cast.
Still, an astounding discovery! I bet Gaspar would be prominent in Kato's mind if the Dream Team or elements thereof ever writes another Chrono game.