Bourque, a sixth-round Canadiens draft pick from 2015, was held off the scoresheet in the loss while registering a pair of shots on goal.
He ends his tournament with two assists, eight penalty minutes, seven shots, and a minus-1 differential through four games.
The Otters meanwhile, will now face Habs prospects Mikhail Sergachev and Jeremiah Addison in Sunday's championship game against the host Windsor Spitfires.
The Spitfires enter the final as the tournament's only undefeated team. On Wednesday, Windsor notably took a 4-2 decision against Erie in preliminary round play.
Addison -- the Habs' 207th overall pick from 2015 -- notably, is tied for second among tournament goal scorers with five tallies -- one shy of Otters' forward Dylan Strome.
He and Sergachev could become the latest Habs prospects to lift Canadian Junior hockey's top prize since Victor Mete hoisted the hardware with London in 2016.
Sunday's final is set for 7:00 p.m. at the WFCU Centre in Windsor.
