Arriving in Colorado, McDonald found himself at the centre of another power struggle. Sympathetic to the fact that his wife was less than two weeks away from giving birth, head coach Don Cherry gave McDonald permission to leave the team on off-days to return to his wife in Toronto. But he did so without gaining the approval of general manager Ray Miron, who disagreed frequently with Cherry and fired him following the season. On the ice, McDonald scored 35 goals with the Rockies and finished with a total of 40 between the two teams.