Preseason football is a graveyard of fourth-stringers and practice squad hopefuls fighting for a shot that probably won't come. But here's the thing: Mike Vrabel didn't hire Eliot Wolf to ignore depth. Tonight's Patriots-Colts matchup will feature plenty of fringe roster guys who could genuinely impact the season if they flash in the right ways. The starters sit, which means the team gets a real look at which reserves can actually execute in live action.

The secondary depth chart is crowded enough to make your eyes water—Carlton Davis III, Marcellas Dial Jr., Brandon Crossley, and a dozen others competing for snaps. In Vrabel's scheme, cornerbacks need to understand leverage and gap responsibility. One of these names will separate from the pack tonight. Same story at linebacker, where the Patriots are absolutely loaded with bodies like K'Lavon Chaisson, Amari Gainer, and Marte Mapu. Vrabel's defense demands linebackers who can diagnose plays quickly and get downhill. The film from tonight's game will be ruthless in that regard.

On the offensive side, the offensive line has some interesting mid-roster pieces worth monitoring. With guys like Vederian Lowe, Caleb Lomu, and James Hudson III getting extended reps, Vrabel and the coaching staff can assess who fits the scheme's demands for run blocking and communication. These aren't sexy names, but they're the guys who keep Drake Maye from eating turf when it matters.

The bottom line: preseason is worthless for evaluating star players. But for undrafted guys, late-round picks, and waiver-wire additions fighting for 53-man roster spots? It's everything. Tonight against Indy, we'll see which reserves actually understand what Vrabel wants, and which ones are just taking up space. Pay attention to the tape. That's where roster-building actually happens.

Based on reporting from Pats Pulpit.