The NW Alpine and Melanzana are in a different class, IMO.
Sure, their weight is not dissimilar to even the 160g/m2 hoodies, but they're designed for vastly different climates.
I love my NW Alpine Spider Light. It goes with me when my I/O hoody is too thin. I'd hate to have this in the summer or in the desert – it breathes well, wicks fast, and dries quickly, but it's not comparable to the LW merino hoodies.
For reference, I'd put the NW Alpine Spider Light as an R.75 - heavier than a cap 4, but lighter than an R1.