I think a bit more time for Bergeron to get back into NHL shape. This is pretty much the equivalent of his training camp and so far even though he has given up the puck a few times I've also counted some instances where he showed patience and made a good play moving the puck up the ice to his forwards or defensive pairing.
Bergeron seems to thrive on that PP. He's not Markov and shouldn't be expect to fill his shoes but I think he's bringing alot.
He's got a big shot and that big shot doesn't just have a chance of going in.... it always helps persuade a team's defense to get out of the way.
And he's also making some good passes on PP.
I believe Brendan Witt took one a few nights back....
"The Bergeron project" may very well pay off.