The most compelling thing in any NFL training camp isn't seeing the starters, the coaches or the highly-drafted rookies.
The most compelling thing is the players who may be in their final month of being Detroit Lions. These players are on the bubble, fighting for their careers (or at least their careers in Detroit), trying to avoid "the Turk" on a daily basis.
Some of them will grow to be impact players. Some will be asked to bring their playbooks to the coach's office. After that, some will find new teams, and some will never see an NFL field again.
But regardless of what their future holds, every one of these players is going to be a subject of interest and intrigue throughout the training camp and preseason period, as they fight to sustain their NFL lives.
For many players, the preseason is just a time to get warmed up and get prepared for the regular season. For these guys, it's their only chance to ensure they get to the regular season.