Mailloux is easily one of the most important parts of the organization as the chance to hit on a RD with his frame, reach, skating, mobility, shot, offensive skills and a decent physical game though he's toned it down in the AHL and I think that's smart as he needs to be on the ice putting points in the board not dropping the gloves or running around trying to hit people.
If he can just keep progressing the Habs really could have something here as he has several NHL tools but the defensive game of course is the big concern and I am not sure the IQ is there as he will do some dumb things in his own end but even that is showing a lot of improvement so far.