So long and thanks for that postseason double, Delmon. You'll always have a place in Orioles lore, but your time with the 2015 Orioles has run out. Young was DFA'd when the O's added Tyler Wilson from Norfolk.
Baseball rosters are a zero sum game, and adding someone means that someone else must be taken off. The Orioles, you have probably noticed, have been flush with corner outfielders for some time, not all of whom are performing well. They are also currently short-handed in the bullpen, having only six relievers and no long relief man. All of this means that Delmon Young's time has finally run out.