Duran is years away from impact, at the plate, and in the field. Yorman (from what I've heard from people in the know) will be playing a great CF within a year, with plus plus speed. Pure athletes like that have a chance of catching on quickly. Not that Duran isn't an athlete, but he is just a monster that is still catching up to his growing. I'm combining ceiling and ETA here, and Yorman's ceiling is high, and his bat is probably ahead of Duran's already, and his fielding definitely is, esp. at a premium position.