Cap limit is dollar based on 23 man max roster limits. Only if you have less players sitting in the pressbox per game can you save cap space.
Leafs could still dress 12 forwards and give their stars an extra shift rotating in on 3rd and 4th lines and the Salary cap unaffected by the # of players you dress for a game.
I think the word
"load management" is going to come into play as the more TOI/g the more taxing it is on a player and his body as the season progresses.. The Raptors playing out of the same building owned and operated by the same ownership just realized the value of winning a championship via star player Kawhi Leonard's 'load management ..
Making the playoffs only step one in the process and how much left in the tank when the playoffs start will be impacted by taxing your star players more during the regular season. That is why some teams do prefer deeper teams and using load management on their stars, keeping them fresher for the playoffs, when it really matters.
$1o mil Mitch is certainly able to jump on the ice with 4th liners Gauthier and Agostino for an extra shift a period, but between PP and PK and regular shift I say that strategy is likely to make Marner less effective during his other shifts, that its less likely something the coach would consider on a regular basis. Shortening the bench more something you see used late in games when trailing. IMO
The consequences on paying your stars more comes with the belief you now must play them more also to validate that investment cost, because the talent gap between the have and have nots now is greater as a result of paying your stars more.. However it comes at a player efficiency cost as the downside of both endurance and health.