I think I understand what you're trying to say, but if you ask me, how can you conclude that ANY two months are the "least" important. Maybe if you're actually playing them that would make them less important.
However, that's a quarter of your teams schedule and that's assuming he recovers on time. And especially for a new player, those two months are the time when you start learning to gel with your new team, learning their system, and adapting to your new role should it not? And what will happen if he returns and doesn't start producing immediately? We ALL know how well Hossa deals with the spotlight.
Also, nobody but Wings fans KNOWS that their team will be in the playoffs at the season's end.