Chaff gets you low value returns. Gibson, Esco, Dozier, and Rodney are the only players with a real chance of landing prospects that could help. Baseball players, cruel as it is, are diminishing assets as their age increases and team control expires. Gibson makes a poor bet to extend, likewise the others. If the concern is acquiring decent players for 2019, the team has ample means to do so in the offseason. And they'll have any traded-for assets in addition.