The only way your 8 game a season goon prevents Lucic going after Weise if he wants to is if Weise is the player scratched to allow him the goon to sit on the bench for 56 minutes.
This is essentially the problem with your theory.
Why ? were not putting the guy on the first like to protect galchenyuk. he will play the fourth. If lucic gets all handsy with weise, weise can skate away, and instead of waiting for lucic the push the issue, our guy could line up across from lucic and press the issue himself.
Or if they are on the ice at the same time ( like parros/subban) everyone is satisfied. Or if we have another lucic/miller incident where someone runs price, the next time we play we dont have to show our degree of offense by sending guys out to be punching bags or by looking to the refs and throwing up our hands.
The habs were 5th in fights last year, the habs will have fights this year. How many remains to be seen, but if we are getting tougher ( as some claim) it seems reasonable that we could stay in the top third. The problem is, we lost the one true heavy ( stashy) and another guy who could go when mad ( murray). so who takes up the slack ? Tinordi ? Or do we tell prust, we know you are a good middle but you have to take on all comers because you are the only one that can. If you go against a heavy, you will probably lose but try not to get killed out there, m'kay ?
If we drop fights by a a quarter this year that's still about thirty fights for the team. You want the 2008-2009 prust who dropped them 25 times ? so do I but I dont have a time machine. He dropped them about a dozen times last year which means you have to account for another 18 fights. 18 fights spread over a team with perhaps one and a half guys who can fight is still a lot.