@Choip, Obviously, English matters for immigration purpose, but there is another point. CRS is designed to calculate a score for those who are going to immigrate under other programs where competition (ranking) is a crucial part of the immigration process. As for the OINP MA/PhD program, there are significantly different criteria, and that is why this program is so popular, as far as some other provincial programs. Anyway, I believe the IELTS score is not a pivotal point in terms of the order of evaluation.
Good luck with your application!