Wentz isn't a pocket QB that gets sacked and hurt. In fact, the way QBs in the pocket have to be tackled the odds of getting a concussion are greatly diminished.
Wentz got his knee torn up against the Rams (running), and he's always trying to escape the pocket or is trying to pick up yards running..which is no doubt how he got his back broken.
Maybe you can make that analogy with Aikman when he starts getting concussions, but he's not had one yet that I recall......then again I had a lot of concussions (just kidding).
