Fullbacks are not that high priority of a position, if shelton goes down a tight end fills in for the rest of the game, and you sign one off the list off free agents, Half way decent one arent that hard to find and the playcalling for a fullback isnt rocket science, and the pass routes are pretty simple. Depth is much more important to have elsewhere like defensive back and WR, because there are formations with 4 and 5 on the field and they are more likely to get nicked up