NFL mandatory minicamp Day 1: OBJ's debut, Diggs' absence

This week in the NFL is the busiest of the minicamp season as 21 teams are holding workouts. Last week, nine teams held minicamps, including the Dallas Cowboys and Detroit Lions. Two teams, the New York Jets and Philadelphia Eagles, chose not to have mandatory minicamps.

Here are some snapshots, many from ESPN's NFL Nation reporters who are on the scene at this week's activities, from Tuesday's minicamps:

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Coach says Stefon Diggs not at camp; agent says he is

Bills coach Sean McDermott said Tuesday that Diggs is not at the team's mandatory minicamp, but the wide receiver's agent had a different story. McDermott called Diggs'…