The Swans chose the worst possible time to turn in their most disappointing performance of the year, going down by 67 points to Hawthorn in the season decider.
The full squad returned to training on Monday.
The team still hasn't watched a full re-run of the game, and according to Jack, they probably won't.
"We watched a half a game on the Tuesday after the Grand Final and that was probably enough," Jack told reporters.
"You probably could have seen in the first quarter we weren't right, so there's no real need to go back and de-construct it."
While the big loss continues to haunt Jack, he says the team won't dwell on the game but use it to spur on their 2015 campaign.
"I can still play over parts in my mind," he said.
"But at some point you've got to move on from it. And we have moved on from it.
"We stewed on it for a long time and I dare say it'll be used as motivation for a lot of these days going forward."
Lance Franklin shares a joke on the resumption of pre-season training in Sydney. (Picture: Getty Images)
In recent seasons the Swans have made a splash in free agency, adding stars Kurt Tippett and Lance Franklin in 2012 and 2013, but this off-season is the first they've been hamstrung by an AFL trade ban for their controversial cost of living allowance.
While the Swans plan to challenge the ban in a specially-convened meeting of the AFL Commission on December 15, they have been forced to turn to youth, adding academy graduates Isaac Heeney, Jack Hiscox and Abe Davis to their list via the draft.
"It certainly has been a disadvantage, not being able to potentially lure talent to your club," Jack said.
"But we'll deal with what we've been given and we still think we have a very competitive list.
"We've picked up a number of good kids - Isaac Heeney is obviously one that's taking a few headlines and he's looking really good."
