From the sound of it, the back was not an issue all week and didn't bother him. He apparently re-aggravated it sometime before the game (probably on a BP swing or something) and couldn't pitch. If that's the case, there's no sense in treating his back if it's not bothering him at all. I disagree with that. If your ace pitcher, who you owe a lot of money too, has to leave a game early because of back problems, it only makes sense to be precautionary and give his back some treatment. I dont care if Z said he felt better than ever, injuries dont usually just disappear, so be on the safe side and give him some treatment. If there's no lasting pain, though, what do you treat? I don't know exactly what the pain was that he felt, but if it was just a twinge of pain and they decided to pull him but then it got better - what treatment should they have done? And the amount of money the Cubs are paying him is rather meaningless in this. Had he gone out on the mound despite feeling some pain and then ripped some muscle in his back and was out for the year, then yeah that's being careless with him. But his back felt fine (apparently) all week, but then was re-aggravated before the game, so they didn't even let him take the mound. From what I can tell, they were being as cautious with him as they could be.