Probably since it's Ivory's profession. But.... ....a 22olb Ivory running into a 320lb D-Lineman isn't as sexy as a 320lb Richardson running full speed into a 180lb DB! If Cromartie was still in SanDiego I wonder if he'd step into the hole to try and shut Richardson down? bahahahaha
Only on two occasions...To set up a throw to the TE, and when going up the middle is necessary towards the end of the game.
Only issue is that the techniques and positions required of a full back are so different and unfamiliar to Sheldon that it does risk injury even if the contact itself is not as violent as it is in the trenches.