Let's see if Arcanist retains any of its "planned" spells, like the HP/MP/TP regen spell etc -- If so SCH still could branch off from it in the future since the XI iteration of SCH based on storyline, they're also very well versed in weather magic as well as concealing and utilizing trap style magic (i.e Paralyze/Blind/Silence tubes which players later gained access to via AN.)

If summoning comes from Arcanist, being well versed in other temporal and geological magic isn't out of the question.