Per the rules of the NFL's Collective Bargaining Agreement, coaches and players aren't allowed to work together or perform drills during the offseason outside of specific training sessions, however, the players are allowed to do whatever they want together throughout the entire offseason.
That is exactly what the Tampa Bay Buccaneers offense has done multiple times this offseason, as JoeBucsFan.com points out. The player who organized the sessions was none other than starting quarterback Josh McCown. According to the website, attendance at these training sessions for the offense was perfect and it wasn't your average pitch-and-catch session either. Apparently the entire offense went through rigorous sessions, outlining the complex details of the playbook, with each player attempting to master his role in the offense.
"That says something about our group. Everybody on the offense showed up. It was great for building chemistry and just to get going and learning. It was very serious. Very professional," new wide receiver Louis Murphy said, according to JoeBucsFan.com. "With the CBA rules we can’t do it here, so our leader Josh [McCown] calling up, we had great sessions. Great for team chemistry."
There's still a question of whether or not the veteran McCown will actually be the team's starting quarterback come September, but so far it appears he has the role of being a leader down pat.