Who will emerge as Ottawa’s go-to netminder? Right from the outset, let me emphasize that I have thoroughly enjoyed the Ottawa Senators’ offseason from a roster-construction perspective. Long live the Summer of Pierre. We have already established that the offence will look much better. And we have written ad nauseum about how the Sens probably need one more minute-eating defender to really give them a shot at a playoff berth. “The Dorion” has also done a pretty decent job navigating the salary cap. He got rid of Matt Murray’s contract! And we haven’t talked too much about goaltending since our…