His gleeful greed and selfishness was naturally offset by Syl Dukett's calculating nature and they worked well together. A thug and thief, Nyk was the epitome of the Imperial mindset. He never minded the marginalization of the Marines - it meant nobody was watching. He was a top Lieutenant for Dukett by the time they assassinated High Inquisitor Volytar.
Although Nyk ended up with Volytar's lightsaber, it was not recovered from his corpse.