In the world of professional sports, athletes change agents with some amount of frequency. However, they tend to do so after the start of their careers rather than before they've signed their first professional playing contract. Green Bay Packers second-round pick Josh Jones has become an example of the latter, deciding to fire the agent that represented him during the draft process and hire Drew Rosenhaus.
Since the ratification of the 2011 collective bargaining agreement, contracts for drafted rookies contain few elements over which to haggle. The CBA effectively caps both the compensation and length of the deals, leaving just offset language and certain guarantees up for serious negotiation.