One of Berman's key points was that Brady did not receive the proper advance notice to be disciplined by the NFL and information of the kind of penalties he could receive.
Per Berman: "The Court finds that no player alleged or found to have had a general awareness of the inappropriate ball deflation activities of others or who allegedly schemed with others to let air out of footballs in a championship game and also had not cooperated in an ensuing investigation, reasonably could be on notice that their discipline would (or should) be the same as applied to a player who violated the NFL Policy on Anabolic Steroids and Related Substances."
In his 40-page decision, Berman mentioned the league's improper denial of Brady's right to cross-examine NFL general council Jeff Pash, who was a co-lead investigator along with Wells. Because Pash was able to "review a draft of the Wells Report" and provide written comments and edits, it would have been in Brady's best interest to question him. The NFL opted not to on the grounds that Pash provided no substantive role in the Wells Report findings and that any edits or comments he made had no impact on the final result.
Per Berman: "It is logical that he would have valuable insight into the course and outcome of the Investigation and into the drafting and content of the Wells Report. It is also problematic to the Court that there was no specification by Goodell as to the ways Pash's testimony would have been 'cumulative.'"
Source:
http://www.nfl.com/news/story/0ap30...udge-nullifies-tom-bradys-fourgame-suspension