In several kingdom questlines, older characters make an appearance: Emperina in Glacial Peaks, Raven in Dragon’s Claw, etc.
It’s possible, though unlikely, to get to Glacial Peaks without ever opening Khaziel, or Dragon’s Claw without getting through Mist of Scales. What happens to the questline in those cases? Does Tassarion banter with himself? Does Visk place far too much trust in the hero?