Two, no, three things, Ryan–
1. The vest I don’t see as something always or even mostly worn–I would put it in the Base Weight ( as I did the Wisp Windshirt). I know, you are clinging to sub 5 like a snow leech ;-)>
2. I don’t think the vest gives as much bang for the weight as the windshirt. Snowcave digging pro, blocking wind to make the MW layer more useful as thermal insulation, etc.
3. The vest w/ a shell and the MW shirt would be a killer combo if you decided to ditch sub5. A highly versatile and lightweight combo in any season–and w/ the VB jacket, da bomb for low temp. UL Winter travel.
have you noticed that only 3.2 oz. seperates our 2 lists when added as pre-food/ water/fuel skinout weights?

