I'm not so sure. Hartnell is a really experienced guy. He goes to all the tough areas, which frees up space for G along the boards. They developed a lot of chemistry last year and it cannot be considered an insignificant effect. G had 65 assists last year. I dont know how many of Hartnell's 37 goals are in that group, but I would imagine a fair few. G wont have as many assists, as he does not have a 37 goal scorer to line up with. Also, no one on the team can replace what Hartnell does in front of the net. His production will most certainly be affected.
O&B Dream Team
Bill Barber - Bobby Clarke - Tim Kerr
Mark Howe - Chris Pronger