McCabe is out due to injury, and the team is playing effective defense. Is there a correlation here? I would say probably yes. I'm not sure about the efffect of Tucker being out, although I suspect it helps,too.
I didn't watch the game because I refuse to pay for Leafs TV. However, I was glad to read The Toronto Star's report on the game tonight. By this account, the Leafs neutralized - almost - Crosby the Kid and managed to score in bunches. I hope they like the feeling and continue to play this way.