Toronto has been doing absolutely fine without their captain, going 3-0-0 over the last week and outscoring opponents 11-2; so they aren't having issues putting the puck in the net. Their powerplay has exploded into a dominant force, and their defense has quietly become one of the league's best.
Toronto not only needs to be cautious about bringing people back too soon, but it needs to be cautious about how they play. This litany of injuries could be a factor of Craig Berube's system, and while he can't afford to have them take the foot off the gas, he needs to be careful not to overwork his players.