He wouldn't sign an offer sheet knowing Winterpeg can match.
He will just sign his QO once again and reach his UFA status.
I agree that Dubois won't sign an offersheet, unless it is for one year.
But no team will look to give him the money he'd be worth on an offersheet with the corresponding loss of a 1st-round pick+ potentially, and the fact that Dubois could leave after that one year due to reaching UFA status for '24-'25.
The only potential way to abuse the fact that Dubois is eligible for an offersheet (after season but only until July 5th if he refuses to sign his QO, before team-elected arbitration protection would apply*) would be for a team like Montreal, which would be looking to extend him after the one year deal, to sign him to a one-year offersheet.
The scenario that would most screw-over Winnipeg and won't happen, as it would be both humanly and financially dumb of Dubois to do so, would be for him to sign a one year, sub-$1.386M offersheet.
In that scenario, the Jets get nothing back for Dubois if they let him go because of compensation thresholds. But if they match the offersheet, they also now can't trade him for a year afterwards, which leads straight to UFA.
It would be truly "Get rekt Winnipeg! time", but fortunately extremely unrealistic.
Now, back to more realistic matters, as for Dubois' QO, I think he would be smart not to sign it when it inevitably is tendered by Winnipeg this Summer. And the reason is that if he refuses to sign it and gets taken to arbitration, the corresponding award by the arbitrator should be plain higher than the $6M that this QO would entitle him to.
Meaning that Dubois could theoretically make more money than the $6M of his QO next year thanks to arbitration AND still be in line for full UFA status for 2024.
It just seems like a no-brainer, smart business decision to me. And also way less disrespectful than the highly toxic, pure hyperbole "Get rekt Winnipeg!" scenario.
*
More on that here:
HOW SALARY ARBITRATION WORKS IN THE NHL - Beyond the Playbook