But it appears those theories will remain just theories.
The NFL has "no plans" to investigate Brown's antics in Oakland and his subsequent signing in New England, NBC Sports' Peter King reported Monday morning, citing a league source.
There have been plenty of juicy rumors since then, most notably a report that Brown sought advice from social media consultants on how to accelerate his release from the Raiders, which may have led to him posting a private letter from Raiders general manager Mike Mayock on Instagram that played a significant role in his exit.
Patriots head coach Bill Belichick also has a close relationship with Brown's agent, Drew Rosenhaus, and reportedly tried to trade for Brown back in March. Brown and quarterback Tom Brady have admired each other from afar, as well, leading some to believe that Brown conspired with the Patriots to work his way out of Oakland so he could join the defending champs.
"If I were (Steelers head coach) Mike Tomlin or (Ravens general manager) Eric DeCosta or (Chiefs head coach) Andy Reid or (Colts general manager) Chris Ballard ... the way this whole story went would really bother me," King wrote Monday morning.
Then again, Brown reportedly had other serious suitors who apparently had several hours Saturday to get a deal done with the star wideout. Belichick and Co. beat those suitors to the punch, and it appears New England's competitors will have to live with that.
Josh Gordon: Brown needs to find 'his own way' in New England
Click here to download the new MyTeams App by NBC Sports! Receive comprehensive coverage of your teams and stream the Celtics easily on your device.
Did Patriots tamper with Antonio Brown? NFL won't investigate, per report originally appeared on NBC Sports Boston