ARL Commission chairman Peter Beattie said Cummins wouldn't have been feeling good following the grand final.
Referee Ben Cummins waved his arms in the air to signal six again but, when Wighton was tackled with the ball, they ruled a turnover.
"I think he had a raucous night of celebrations".
Former NRL Match Review Chairman Greg McCallum tells Ben Fordham the referee should have stuck with the six-to-go call.
It was one of those tough calls, with players from each side contesting a high Raiders kick.
James Tedesco scored the match-winning try in the 72nd minute, but it came off the back of a controversial referee decision which has dominated post-match headlines.
The Raiders rallied from that setback and went close to hitting back five minutes later when Elliot Whitehead was held up after Wighton's attacking kick on the fourth tackle had caught Sydney off-guard.
Beattie mirrored the view of NRL head of football Graham Annesley who insisted the correct call was made even if the process was wrong.
Wighton ran it close to the line and as he did so the call was changed to last tackle. "But if they had not corrected the decision and the Raiders had scored, I'd probably still be sitting here telling you a try had been scored off an incorrect decision". Despite being outspoken of his criticism of the referees throughout his career - and fined on 10 occasions for a total of $125,000 - Stuart he refused to comment on the issue.
"I said to him 'did you not call six again?' I thought we defended really well to come in (trailing) at 8-6 with the amount of possession we had in the first half", he said. Souths co-owner Russell Crowe took to twitter to describe it as a "horseshit result".
The penalty was awarded against Cooper Cronk for tackling Josh Papalii without the ball and the Roosters halfback was sent to the sin bin for his transgression. "That's why I asked him if he called six-again and he said no, I called five-and-last".
A converted try from Sam Verrills and penalty from Latrell Mitchell put the Roosters ahead, but Jack Wighton's try and the conversion from Jarrod Croker ensured the Raiders trailed by just two at the break.
Not like a Canberra player would have liked to show it off, or anything...
Annesley said he was also comfortable with Cronk's sin-binning.