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I just got Swaine and by sheer coincidence, my Gold Hurly and his Hurly are level 19. They have the exact same stats even though my Gold Hurly started at level 1. I never bothered leveling Hurly since then, so I can't tell you if their stat growths continue to be the same. If they are, and the rumors that Gold familiars in non-JP version still have level caps, what's the point of using Gold familiars?