ProFootballFocus used to provide player participation data, then moved that content behind a pay wall last year at a prohibitive cost for most. I'm not sure it's available at all this year.Some beat writers will count up snap counts at each position and note them in blog posts by midweek, but it's hit or miss at best.I do a fair amount of film review of defensive players every week during the season. It won't be accurate to the snap, but I can provide some idea of percentages and usage if there are a few players in which you're interested.