You can add more story arcs indefinitely for sure, but why? Turalyon only has a familiar name, something he shares with other characters who actually could use a proper story arc.
Again, why not accept that Turalyon had a perfectly satisfactory story arc and give some space in teh story to his son instead? Arator's story hass pretty much started and ended with wanting to find his parents, why not give a big moment of discovery regarding the light to him instead?