I've already watched one Auburn quarterback get his shoulder broken in multiple places by landing head first. Zorn tried everything with Jason to teach him to slide feet first and never could. Even brought in a kid's slip and slide to practice. I still think, though, there is more of a risk of Cam tearing an acl/mcl getting his foot caught in the turf than of a defender breaking his collar bone by landing on his shoulders.
I wonder what Davis said to Cam when Cam was mugging for the camera towards the end of the game. I know. It was just a preseason game but Davis looked very annoyed and I noticed that he walked 30 yards to say something to Cam.