I would guess that Rizzo has tried to trade Victor, probably for years and years. As I keep think of ways to get Nunez off the 26-man roster. But I doubt Miami would trade the rights to Nunez for hopeless Robles. Just cut him.
Over and over, Victor does something good. Gets praised. And does something heroically dopey. Seems like his problem has always been emotional, rather than physical. DFA him.