I do not see how a "do over" would change anything... The league is not going to just throw away what they have, the NFLPA was asked to be part of the investigation already and they "chose" to do their own thing. This is more of a tactic to try and see everything which the NFL has already told them no on.

Smith: This is where you messed up yet again.
"Smith and the NFLPA were invited to be a part of the NFL's investigation, according to a league source, but the union declined and conducted its own investigation."

This is Smith trying to keep the fire stoked. He has based his statements on "assumptions". Of course the testimony the NFL received was complete, and of curse they hand picked what they wanted to release.

Smith mishandled this from the start when he told the players to not go to NY and talk to the league... That was a show of "non-cooperation".