[The Might]

yes, I read a little bit more and I guess the Ered Engrin were never in plan
as symmetry you have the Blue Mountains in the West and the Red in the East, the Grey in the southwest and the Yellow in the southeast
The only ones made by the Valar that had no range opposing them were the Mountains of Wind between the Red and the Yellow, perhaps to suggest that the right way was to the West and not East
Ered Engrin didn't actually had any range opposing I was wrong about that