Pop quiz, hot shot: you have a pitcher who can’t throw strikes and a bullpen that is, by far, the team’s weakest link. What do you do?
If you’re the Arizona Diamondbacks you put that pitcher in that bullpen and hope one of the fundamental laws of the universe (i.e. relief pitchers must throw strikes) is suspended in the greater Phoenix metropolitan area.
Look, Dontrelle Willis was a great pitcher for a while. He has sadly lost his mojo, however, and despite being given multiple chances, he does not look like he’s going to get it back. This is Major League Baseball. Not a charity ward. If Willis is to be pitching anywhere, he needs to be pitching someplace where he won’t be impacting games that matter.
And yes, even though the Dbacks are out of it, many of their opponents are not, and this grand experiment is simply bad for baseball. DFA him or waive him or do something to him, but by no means should he be pitching in the majors at this moment in time.