Michelle is definitely dead. I am sure that's what they said, killed Michelle and Tony was in bad shape. The thing is, you still do CPR even if there's no pulse, and no breathing, don't you? Not that it would have mattered at that point, with the secondary explosion.
I don't know. I would think it would depend on the type of injuries. Another thought is it's "better TV" to see Tony craddling her when there's the secondary than if he was doing CPR.
We shall see. She could wind up later on assisting Jack and Chloe and I have a feeling derek will be around for a while, he got way to much screentime in the first two hours to be killed off quickly, they are building his character.