I think it is inconclusive at this point if the cops gravely injured Freddie Gray. They may have, but at this point that is not clear. What is clear is the lack of concern for his distress. That they did not call for EMS is not right.
Whether they did or not isn't important to the point I was trying to make. 2Thick suggested that what happened is, somehow ok, because of Gray's rap sheet; he basically suggests that if you have a rap sheet you're a second class citizen, whose life can be snuffed out by cops. This is legally wrong and fundamentally immoral.
To your point: I'm not privy to all the evidence so I can't say if these cops injured Gray. Not that my opinion will matter since I won't be on the jury. But from what we have heard - and seen - so far the conclusion that Gray suffered grave injuries at some point after he was originally arrested and before arriving at the station, while in the custody of Baltimore police is inescapable. Furthermore, the type of injury he is alleged to have is unlikely to be self inflicted, especially in the confined space he was in. And if the injury wasn't self-inflicted, there's only one other option. We'll see what comes out during the trial.
By the way, I take exception at the FOP statement that these officers did their job. The FOP, and statements like that, is why the public is growing weary. Even if the cops hadn't injured Gray, Gray was in their custody and they had a duty and an obligation to provide him with prompt medical attention which they didn't do.