Dayton can actually use both of them. Dayton's offense is pretty anemic this year, especially among OFs. Not sure why they sent Yorman down to extended spring training instead of Dayton, unless they saw a mechanical flaw in his swing that they're trying to fix before playing him in "real games."
Duran is what he is. Wily Mo Jr. He's going to hit his share of HRs (and some really long ones in fact) but he'll never make enough contact to be a legit Major Leaguer IMO.