In the NFL, much of the focus on team-building is on the upper echelon of the draft. First-round and second-round picks are valued like gold; they can turn around franchises if made correctly or set them back for multiple years if missed.
An underrated aspect of the team-building process is the later rounds and undrafted free agents. While some become superstars, those are rare. It is more likely that these players fill holes at the middle or back ends of rosters, such as a fourth wide receiver or a critical special teams contributor. These spots are not glamorous but are still some of the most important roles on NFL rosters.