The union filed a lawsuit in district court in Texas that seeks to vacate any suspension of Elliott, if such a suspension is upheld by arbitrator Harold Henderson.
Roberts, the NFL's director of investigations, testified that she would have recommended no suspension for Elliott.
The six-game suspension was given to Elliott almost three weeks ago upon the completion of the NFL's 13-month investigation into claims that the running back abused Thompson. She said during the appeal hearing she was the only league official to interview Elliott's accuser, according to ESPN.
NFL Senior Vice President Lisa Friel is reportedly who both recommended the six-game suspension in the first place and then subsequently barred Roberts from talking to Goodell.
Friel testified that she was aware of Roberts' concerns and also confirmed that Roberts was not asked to attend the meeting.
And according to ESPN's Adam Schefter, there's a sense that Elliott's suspension could be reduced as a result of the appeal process. As of right now, the Dallas Cowboys will be without Ezekiel Elliott until Week 8 against the Washington Redskins, but we should have a definite decision in the appeal by Monday at the latest.
The date is key because if a decision is not made by Tuesday, Elliott could be on the field for the September 10 season opener against the New York Giants. This means Elliott potentially could be permitted to play in the Cowboys home opener against the Giants and any game thereafter while the case works its way through the courts.
"Elliott's defense team consists of his attorneys, Frank Salzano and Scott Rosenblum, as well as two attorneys from the NFLPA, Jeffrey Kessler and Heather McPhee, who both have had previous litigation success against National Football League".
The NFLPA alleged in the filing that "there was a League-orchestrated conspiracy by senior NFL executives ....to hide critical information - which would completely exonerate Elliott".