I'd say if mike green comes to Detroit he will never put up over 55 pts. Detroit is a two way team and won't want it's defensemen taking to much risk to get points. Look at Smith they moved him to forward to use his offensive skills and kronwall has had to be conservative since Stuart left
If Mike Green comes to Detroit and puts up 40-55 points a season, that's fantastic and all they need. They'd expect him to develop his defensive game, much like they expected it of Bertuzzi and he improved in the twilight of his career, so it's not out of the question.